add header rescan button to apply officer-items changes without restart

New POST /api/rescan re-runs the boot item setup (ensureItemDirs +
ensureToolLoader) and returns live item counts; the header button calls it
and invalidates the item query caches so the UI refetches from disk.

Also fix ensure-tool-loader to write into OFFICER_ITEMS_DIR/extensions (the
runtime read path) instead of the now-unread DATA_PATH/extensions.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/hono.ts

@@ -12,6 +12,7 @@ import { skillsRouter } from './api/skills/skills';
 import { tasksRouter } from './api/tasks/tasks';
 import { toolsRouter } from './api/tools/tools';
 import { processesRouter } from './api/processes/processes';
+import { rescanRouter } from './api/items/rescan';
 import { scrapeRouter } from './api/scrape/scrape';
 import { uploadRouter } from './api/upload/upload';
 import { settingsRouter } from './api/settings/settings';
@@ -85,6 +86,7 @@ protectedRouter.route('/skills', skillsRouter);
 protectedRouter.route('/tasks', tasksRouter);
 protectedRouter.route('/tools', toolsRouter);
 protectedRouter.route('/processes', processesRouter);
+protectedRouter.route('/rescan', rescanRouter);
 protectedRouter.route('/scrape', scrapeRouter);
 protectedRouter.route('/upload', uploadRouter);
 protectedRouter.route('/user', settingsRouter);