feat(plaza-ops): add post management API for admin console

Expose categories listing, category filter on review queue, and invalidate
feed caches when ops hides a published post.

Co-authored-by: Cursor <cursoragent@cursor.com>

plaza-api.mjs

@@ -434,6 +434,14 @@ export function attachPlazaApiRoutes(api, plaza, { sendData, sendError }) {
   opsApi.use(express.json({ limit: '1mb' }));
   opsApi.use(makeRequireOps('reviewer'));
 
+  opsApi.get('/categories', async (req, res) => {
+    try {
+      return sendData(res, req, { categories: await ops.listCategories() });
+    } catch (error) {
+      return routeError(res, req, error);
+    }
+  });
+
   opsApi.get('/review/queue', async (req, res) => {
     try {
       const queue = await ops.listReviewQueue({
@@ -441,6 +449,7 @@ export function attachPlazaApiRoutes(api, plaza, { sendData, sendError }) {
         cursor: req.query.cursor ?? null,
         limit: req.query.limit,
         keyword: req.query.keyword ?? null,
+        category: req.query.category ?? null,
       });
       return sendData(res, req, queue);
     } catch (error) {