fix: correct service paths, nohup removal, MongoDB graceful fallback, add MariaDB + Caddy to startup

- Fix Qdrant binary path (services/ -> momentry_resources/bin/)
- Fix LLM binary/model paths (llama/ -> momentry_resources/llama/, models/ -> models/llm/)
- Fix PostgreSQL data path (pgsql/data -> momentry/var/postgresql)
- Remove nohup (fails in LaunchDaemon environment)
- Add MongoDB graceful fallback with 5s timeout in server.rs
- Add MariaDB + Caddy steps to startup script for WordPress
- Revert all unrelated changes

src/core/cache/mongo_cache.rs

@@ -80,6 +80,25 @@ impl MongoCache {
         Ok(cache)
     }
 
+    /// Create a disabled cache instance — all ops are no-ops (is_enabled() = false).
+    /// Used when MongoDB is unavailable; Redis cache continues independently.
+    pub async fn disabled() -> Self {
+        let client = Client::with_uri_str("mongodb://localhost:27017")
+            .await
+            .expect("disabled mongo client (lazy — no actual connect)");
+        let db = client.database("disabled_cache");
+        Self {
+            client,
+            db: db.clone(),
+            collection: db.collection("disabled"),
+            settings: CacheSettings {
+                enabled: false,
+                ..Default::default()
+            },
+            initialized: Arc::new(RwLock::new(false)),
+        }
+    }
+
     async fn ensure_indexes(&self) -> Result<()> {
         let mut guard = self.initialized.write().await;
         if *guard {