fix(cliproxy): correct sync terminology and add unit tests

- Fix "Remote" → "Local" in sync-dialog.tsx and CLI help text
- Add resetWatcherState() export for test cleanup
- Add unit tests for profile-mapper, local-config-sync, auto-sync-watcher
- Remove unused ModelAlias and AliasesResponse types from hooks

src/commands/cliproxy-command.ts

@@ -617,9 +617,9 @@ async function showHelp(): Promise<void> {
       ],
     ],
     [
-      'Remote Sync:',
+      'Local Sync:',
       [
-        ['sync', 'Sync API profiles to remote CLIProxy'],
+        ['sync', 'Sync API profiles to local CLIProxy config'],
         ['sync --dry-run', 'Preview sync without applying'],
         ['sync --force', 'Sync without confirmation prompt'],
       ],