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/runtime-package.json

@@ -4,6 +4,7 @@
     "version": "0.0.0",
     "description": "Runtime dependencies for Self-hosted LiveSync CLI Docker image",
     "dependencies": {
+        "chokidar": "^4.0.0",
         "commander": "^14.0.3",
         "werift": "^0.22.9",
         "pouchdb-adapter-http": "^9.0.0",