cli: implement local→CouchDB file watching via chokidar

- Add chokidar ^4.0.0 as dependency (root package.json, runtime-package.json)
- Mark chokidar as external in vite.config.ts (not bundled, loaded at runtime)
- Implement CLIWatchAdapter.beginWatch() with chokidar:
  - ignoreInitial: true (startup files handled by mirror scan)
  - awaitWriteFinish to prevent partial-write events
  - Excludes dotfiles and .livesync/ directory at watcher level
  - Maps add/change/unlink/addDir/unlinkDir to IStorageEventWatchHandlers
  - Fatal error handler: logs clearly and releases watcher resources
- Add close() to CLIWatchAdapter, StorageEventManagerCLI for clean shutdown
- Register onUnload hook in CLIServiceModules to close watcher on shutdown

src/apps/cli/managers/StorageEventManagerCLI.ts

@@ -10,9 +10,10 @@ export class StorageEventManagerCLI extends StorageEventManagerBase<CLIStorageEv
     constructor(
         basePath: string,
         core: LiveSyncBaseCore<ServiceContext, IMinimumLiveSyncCommands>,
-        dependencies: StorageEventManagerBaseDependencies
+        dependencies: StorageEventManagerBaseDependencies,
+        watchEnabled?: boolean
     ) {
-        const adapter = new CLIStorageEventManagerAdapter(basePath);
+        const adapter = new CLIStorageEventManagerAdapter(basePath, watchEnabled);
         super(adapter, dependencies);
         this.core = core;
     }
@@ -25,4 +26,11 @@ export class StorageEventManagerCLI extends StorageEventManagerBase<CLIStorageEv
         // No-op in CLI version
         // Internal file handling is not needed
     }
+
+    /**
+     * Close the file watcher. Call this during graceful shutdown.
+     */
+    close(): Promise<void> {
+        return this.adapter.close();
+    }
 }