macOS Time Machine AFP monitoring: backup_time update on file modification

- Added afp_monitor.rs module to track AFP_AfpInfo backup_time
- Open struct now has 'modified' flag to track file modifications
- write.rs sets modified=true on successful write
- close.rs calls AfpMonitor::update_backup_time() on modified files
- create.rs calls AfpMonitor::init_afp_info() on new file creation
- AFP_AfpInfo stored as xattr com.apple.aapl.AfpInfo
- backup_time updated to current epoch time on modification

Also includes:
- LZ4 compression using lz4_flex crate
- Case sensitivity conditional on backend capabilities
- LDAP cfg feature gate fix
- RAID rebuild reconstruction implementation
- DOS attributes xattr persistence
- Snapshot disk persistence

Tests: 201 smb-server, 452 markbase-core (653 total)

Cargo.lock

@@ -720,6 +720,18 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "ccm"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ae3c82e4355234767756212c570e29833699ab63e6ffd161887314cc5b43847"
+dependencies = [
+ "aead 0.5.2",
+ "cipher 0.4.4",
+ "ctr 0.9.2",
+ "subtle",
+]
+
 [[package]]
 name = "ccm"
 version = "0.6.0-rc.3"
@@ -2961,6 +2973,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "lz4_flex"
+version = "0.11.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "373f5eceeeab7925e0c1098212f2fbc4d416adec9d35051a6ab251e824c1854a"
+dependencies = [
+ "twox-hash",
+]
+
 [[package]]
 name = "lz4_flex"
 version = "0.13.1"
@@ -3025,6 +3046,7 @@ dependencies = [
  "lazy_static",
  "ldap3",
  "log",
+ "lz4_flex 0.11.6",
  "md5 0.8.0",
  "nix 0.29.0",
  "once_cell",
@@ -5467,12 +5489,13 @@ name = "smb-server"
 version = "0.4.1"
 dependencies = [
  "aes 0.8.4",
+ "aes-gcm 0.10.3",
  "async-trait",
  "binrw",
  "bytes",
  "cap-std",
+ "ccm 0.5.0",
  "cmac 0.7.2",
- "ctr 0.9.2",
  "getrandom 0.4.2",
  "hex",
  "hmac 0.12.1",
@@ -5496,7 +5519,7 @@ dependencies = [
  "aes 0.9.1",
  "aes-gcm 0.11.0-rc.4",
  "async-trait",
- "ccm",
+ "ccm 0.6.0-rc.3",
  "cmac 0.8.0-rc.5",
  "digest 0.11.3",
  "env_logger",
@@ -5504,7 +5527,7 @@ dependencies = [
  "getrandom 0.4.2",
  "hmac 0.13.0",
  "log",
- "lz4_flex",
+ "lz4_flex 0.13.1",
  "md-5 0.11.0",
  "md4 0.11.0",
  "num_enum",