fix(client/windows): cfapi-Code auf windows-rs 0.58 umgestellt

- Feature Win32_System_CorrelationVector aktiviert (gate fuer
  CF_CALLBACK_INFO / CfExecute / CfConnectSyncRoot / CfCreatePlaceholders
  / CfSetPinState / CF_OPERATION_INFO / CF_CALLBACK_REGISTRATION)
- reqwest "blocking" aktiviert (wird im cfapi-Callback-Thread genutzt)
- Cf*-Funktionen liefern jetzt Result<(), Error> statt HRESULT; alle
  Aufrufe ueber ? / .map_err umgestellt
- CF_SYNC_POLICIES.Hydration/Population sind Wrapper-Structs;
  .Primary-Feld setzen statt direkter Enum-Zuweisung
- LARGE_INTEGER entfernt (Felder sind in 0.58 einfach i64)
- FILETIME-Ticks direkt als i64 schreiben (BasicInfo.*Time)
- FetchData.RequiredFileOffset/Length direkt als i64 verwenden
- CfCreatePlaceholders nimmt Slice + Option<*mut u32>
- CfSetPinState nimmt Option<*mut OVERLAPPED>
- Tauri-Command: MutexGuard vor .await freigeben (Send-Constraint)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/desktop/src-tauri/Cargo.toml

@@ -19,7 +19,7 @@ tauri-plugin-dialog = "2"
 tauri-plugin-notification = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-reqwest = { version = "0.12", features = ["json", "multipart", "rustls-tls"], default-features = false }
+reqwest = { version = "0.12", features = ["json", "multipart", "rustls-tls", "blocking"], default-features = false }
 tokio = { version = "1", features = ["full"] }
 notify = "7"
 sha2 = "0.10"
@@ -39,6 +39,7 @@ windows = { version = "0.58", features = [
     "Win32_Storage_CloudFilters",
     "Win32_System_IO",
     "Win32_System_Com",
+    "Win32_System_CorrelationVector",  # gate fuer CF_CALLBACK_INFO / CfExecute / CfConnectSyncRoot
     "Win32_UI_Shell",
     "Win32_Security",
 ] }