MarkBase架构升级：Multi-Volume Virtual Tree + Dual-View Management + Git Remote修正

核心功能：
- ✅ Categories/Series双视图管理（category_view.rs + import_markdown.rs）
- ✅ FUSE Multi-Volume支持（tree_type参数）
- ✅ SSH/SFTP/SCP/rsync协议完整实现（4042行）
- ✅ NFS/SMB Module Phase 1-3完成
- ✅ Archive Module Phase 1-4完成（2916行）
- ✅ Download Center API完整实现
- ✅ S3兼容API实现（560行）

Git配置修正：
- ✅ 删除错误origin（gitea.momentry.ddns.net）
- ✅ 删除m5max128（指向机器名）
- ✅ 设置origin = m5max128gitea.momentry.ddns.net/admin/markbase
- ✅ 设置m4minigitea = m4minigitea.momentry.ddns.net/warren/markbase

数据清理：
- ✅ 删除38个临时SQLite（保留accusys.sqlite、demo.sqlite）
- ✅ 删除.bak、test_*.bin、调试脚本等临时文件
- ✅ 删除临时目录（build/、download files/、raid_test/等）
- ✅ 更新.gitignore排除临时文件

架构优化：
- 52个文件修改，2434行新增，4739行删除
- Workspace成员整合（16个crate）
- 数据库状态：accusys.sqlite保留（主demo测试）

远程同步：
- ✅ 准备推送到m5max128gitea（远程Gitea）
- ✅ 准备推送到m4minigitea（本地Gitea）

markbase-core/src/config.rs

@@ -65,13 +65,21 @@ impl MarkBaseConfig {
         let config: MarkBaseConfig = toml::from_str(&content)?;
         Ok(config)
     }
-    
+
     pub fn save(&self, path: &Path) -> Result<()> {
+        // Create backup before saving
+        if path.exists() {
+            let backup_path = path.with_extension("toml.bak");
+            std::fs::copy(path, &backup_path)?;
+            log::info!("Backup created: {}", backup_path.display());
+        }
+        
         let content = toml::to_string_pretty(self)?;
         std::fs::write(path, content)?;
+        log::info!("Configuration saved to: {}", path.display());
         Ok(())
     }
-    
+
     pub fn default_config() -> Self {
         Self {
             server: ServerConfig {
@@ -98,7 +106,11 @@ impl MarkBaseConfig {
                 default_password: "demo123".to_string(),
             },
             test: TestConfig {
-                users: vec!["warren".to_string(), "momentry".to_string(), "demo".to_string()],
+                users: vec![
+                    "warren".to_string(),
+                    "momentry".to_string(),
+                    "demo".to_string(),
+                ],
                 password: "demo123".to_string(),
                 login_test_iterations: 10,
                 verify_test_iterations: 100,
@@ -114,7 +126,7 @@ impl MarkBaseConfig {
             },
         }
     }
-    
+
     pub fn merge_env(&mut self) {
         if let Ok(host) = std::env::var("MB_HOST") {
             self.server.host = host;
@@ -127,7 +139,7 @@ impl MarkBaseConfig {
         if let Ok(log_level) = std::env::var("MB_LOG_LEVEL") {
             self.server.log_level = log_level;
         }
-        
+
         if let Ok(pg_host) = std::env::var("PG_HOST") {
             self.postgresql.host = pg_host;
         }
@@ -145,7 +157,7 @@ impl MarkBaseConfig {
         if let Ok(pg_database) = std::env::var("PG_DATABASE") {
             self.postgresql.database = pg_database;
         }
-        
+
         if let Ok(bcrypt_cost) = std::env::var("MB_BCRYPT_COST") {
             if let Ok(c) = bcrypt_cost.parse() {
                 self.authentication.bcrypt_cost = c;
@@ -157,7 +169,7 @@ impl MarkBaseConfig {
             }
         }
     }
-    
+
     pub fn get(&self, key: &str) -> Option<String> {
         match key {
             "server.host" => Some(self.server.host.clone()),
@@ -165,21 +177,27 @@ impl MarkBaseConfig {
             "server.log_level" => Some(self.server.log_level.clone()),
             "server.auth_db_path" => Some(self.server.auth_db_path.clone()),
             "server.users_db_dir" => Some(self.server.users_db_dir.clone()),
-            
+
             "postgresql.host" => Some(self.postgresql.host.clone()),
             "postgresql.port" => Some(self.postgresql.port.to_string()),
             "postgresql.user" => Some(self.postgresql.user.clone()),
             "postgresql.password" => Some(self.postgresql.password.clone()),
             "postgresql.database" => Some(self.postgresql.database.clone()),
-            "postgresql.connection_pool_size" => Some(self.postgresql.connection_pool_size.to_string()),
-            
+            "postgresql.connection_pool_size" => {
+                Some(self.postgresql.connection_pool_size.to_string())
+            }
+
             "authentication.bcrypt_cost" => Some(self.authentication.bcrypt_cost.to_string()),
-            "authentication.token_validity_hours" => Some(self.authentication.token_validity_hours.to_string()),
+            "authentication.token_validity_hours" => {
+                Some(self.authentication.token_validity_hours.to_string())
+            }
             "authentication.session_storage" => Some(self.authentication.session_storage.clone()),
-            "authentication.max_sessions_per_user" => Some(self.authentication.max_sessions_per_user.to_string()),
+            "authentication.max_sessions_per_user" => {
+                Some(self.authentication.max_sessions_per_user.to_string())
+            }
             "authentication.default_user" => Some(self.authentication.default_user.clone()),
             "authentication.default_password" => Some(self.authentication.default_password.clone()),
-            
+
             "test.users" => Some(serde_json::to_string(&self.test.users).unwrap_or_default()),
             "test.password" => Some(self.test.password.clone()),
             "test.login_test_iterations" => Some(self.test.login_test_iterations.to_string()),
@@ -187,16 +205,16 @@ impl MarkBaseConfig {
             "test.api_test_iterations" => Some(self.test.api_test_iterations.to_string()),
             "test.performance_report" => Some(self.test.performance_report.to_string()),
             "test.output_format" => Some(self.test.output_format.clone()),
-            
+
             "logging.level" => Some(self.logging.level.clone()),
             "logging.file_path" => Some(self.logging.file_path.clone()),
             "logging.console_output" => Some(self.logging.console_output.to_string()),
             "logging.structured_logging" => Some(self.logging.structured_logging.to_string()),
-            
+
             _ => None,
         }
     }
-    
+
     pub fn set(&mut self, key: &str, value: &str) -> Result<()> {
         match key {
             "server.host" => self.server.host = value.to_string(),
@@ -204,60 +222,138 @@ impl MarkBaseConfig {
             "server.log_level" => self.server.log_level = value.to_string(),
             "server.auth_db_path" => self.server.auth_db_path = value.to_string(),
             "server.users_db_dir" => self.server.users_db_dir = value.to_string(),
-            
+
             "postgresql.host" => self.postgresql.host = value.to_string(),
             "postgresql.port" => self.postgresql.port = value.parse()?,
             "postgresql.user" => self.postgresql.user = value.to_string(),
             "postgresql.password" => self.postgresql.password = value.to_string(),
             "postgresql.database" => self.postgresql.database = value.to_string(),
-            "postgresql.connection_pool_size" => self.postgresql.connection_pool_size = value.parse()?,
-            
+            "postgresql.connection_pool_size" => {
+                self.postgresql.connection_pool_size = value.parse()?
+            }
+
             "authentication.bcrypt_cost" => self.authentication.bcrypt_cost = value.parse()?,
-            "authentication.token_validity_hours" => self.authentication.token_validity_hours = value.parse()?,
-            "authentication.session_storage" => self.authentication.session_storage = value.to_string(),
-            "authentication.max_sessions_per_user" => self.authentication.max_sessions_per_user = value.parse()?,
+            "authentication.token_validity_hours" => {
+                self.authentication.token_validity_hours = value.parse()?
+            }
+            "authentication.session_storage" => {
+                self.authentication.session_storage = value.to_string()
+            }
+            "authentication.max_sessions_per_user" => {
+                self.authentication.max_sessions_per_user = value.parse()?
+            }
             "authentication.default_user" => self.authentication.default_user = value.to_string(),
-            "authentication.default_password" => self.authentication.default_password = value.to_string(),
-            
+            "authentication.default_password" => {
+                self.authentication.default_password = value.to_string()
+            }
+
             "test.password" => self.test.password = value.to_string(),
             "test.login_test_iterations" => self.test.login_test_iterations = value.parse()?,
             "test.verify_test_iterations" => self.test.verify_test_iterations = value.parse()?,
             "test.api_test_iterations" => self.test.api_test_iterations = value.parse()?,
             "test.performance_report" => self.test.performance_report = value.parse()?,
             "test.output_format" => self.test.output_format = value.to_string(),
-            
+
             "logging.level" => self.logging.level = value.to_string(),
             "logging.file_path" => self.logging.file_path = value.to_string(),
             "logging.console_output" => self.logging.console_output = value.parse()?,
             "logging.structured_logging" => self.logging.structured_logging = value.parse()?,
-            
+
             _ => return Err(anyhow::anyhow!("Invalid config key: {}", key)),
         }
         Ok(())
     }
-    
+
     pub fn validate(&self) -> Result<()> {
         if self.server.port < 1024 {
-            return Err(anyhow::anyhow!("Invalid server port: {}. Must be >= 1024", self.server.port));
+            return Err(anyhow::anyhow!(
+                "Invalid server port: {}. Must be >= 1024",
+                self.server.port
+            ));
         }
-        
+
+        if self.server.host.is_empty() {
+            return Err(anyhow::anyhow!("server.host cannot be empty"));
+        }
+
+        if self.server.auth_db_path.is_empty() {
+            return Err(anyhow::anyhow!("server.auth_db_path cannot be empty"));
+        }
+
+        if self.server.users_db_dir.is_empty() {
+            return Err(anyhow::anyhow!("server.users_db_dir cannot be empty"));
+        }
+
         if self.postgresql.port == 0 {
-            return Err(anyhow::anyhow!("Invalid PostgreSQL port: {}", self.postgresql.port));
+            return Err(anyhow::anyhow!(
+                "Invalid PostgreSQL port: {}",
+                self.postgresql.port
+            ));
         }
-        
+
+        if self.postgresql.host.is_empty() {
+            return Err(anyhow::anyhow!("postgresql.host cannot be empty"));
+        }
+
+        if self.postgresql.user.is_empty() {
+            return Err(anyhow::anyhow!("postgresql.user cannot be empty"));
+        }
+
+        if self.postgresql.database.is_empty() {
+            return Err(anyhow::anyhow!("postgresql.database cannot be empty"));
+        }
+
+        if self.postgresql.connection_pool_size == 0 {
+            return Err(anyhow::anyhow!(
+                "postgresql.connection_pool_size must be >= 1"
+            ));
+        }
+
         if self.authentication.bcrypt_cost < 4 || self.authentication.bcrypt_cost > 31 {
-            return Err(anyhow::anyhow!("Invalid bcrypt_cost: {}. Must be 4-31", self.authentication.bcrypt_cost));
+            return Err(anyhow::anyhow!(
+                "Invalid bcrypt_cost: {}. Must be 4-31",
+                self.authentication.bcrypt_cost
+            ));
         }
-        
+
         if self.authentication.token_validity_hours == 0 {
-            return Err(anyhow::anyhow!("Invalid token_validity_hours: {}. Must be >= 1", 
-                self.authentication.token_validity_hours));
+            return Err(anyhow::anyhow!(
+                "Invalid token_validity_hours: {}. Must be >= 1",
+                self.authentication.token_validity_hours
+            ));
         }
-        
+
+        if self.authentication.default_user.is_empty() {
+            return Err(anyhow::anyhow!("authentication.default_user cannot be empty"));
+        }
+
+        if self.authentication.default_password.is_empty() {
+            return Err(anyhow::anyhow!("authentication.default_password cannot be empty"));
+        }
+
+        if self.authentication.max_sessions_per_user == 0 {
+            return Err(anyhow::anyhow!(
+                "authentication.max_sessions_per_user must be >= 1"
+            ));
+        }
+
         if self.test.users.is_empty() {
             return Err(anyhow::anyhow!("test.users must not be empty"));
         }
-        
+
+        if self.logging.level.is_empty() {
+            return Err(anyhow::anyhow!("logging.level cannot be empty"));
+        }
+
+        let valid_log_levels = ["trace", "debug", "info", "warn", "error", "off"];
+        if !valid_log_levels.contains(&self.logging.level.as_str()) {
+            return Err(anyhow::anyhow!(
+                "Invalid logging.level: {}. Must be one of: {}",
+                self.logging.level,
+                valid_log_levels.join(", ")
+            ));
+        }
+
         Ok(())
     }
-}
+}