feat(dashboard): add moderation log page + message edit history

- Backend moderation module: GET /api/moderation/stats (per-status + failed rate)
  + GET /api/moderation/actions (filter by status/actionType, cursor paging),
  joins messages for target username + content
- Message GET /api/messages/detail/:id now returns edit_count + edit_history
  (old_content snapshots from message_edits, newest first)
- FE: new /moderation page — summary cards (total/executed/failed/pending +
  failed-rate), status+type filter chips, timeline rows with action icon,
  target user, reason, status badge, timestamps, error text
- FE: message detail shows 'Riwayat edit' panel with previous versions

services/backend/src/modules/moderation/moderation.routes.ts

@@ -0,0 +1,43 @@
+import type { Request, Response, Router } from "express";
+import express from "express";
+import { createChildLogger } from "../../shared/logger/index.js";
+import { asyncHandler } from "../../shared/middlewares/index.js";
+import { moderationService } from "./moderation.service.js";
+
+const logger = createChildLogger("moderation.routes");
+
+export function createModerationRouter(): Router {
+  const router = express.Router();
+
+  // GET /api/moderation/stats — moderation action summary
+  router.get(
+    "/moderation/stats",
+    asyncHandler(async (_req: Request, res: Response) => {
+      const stats = await moderationService.getStats();
+      res.json(stats);
+    }),
+  );
+
+  // GET /api/moderation/actions — paginated moderation action log
+  router.get(
+    "/moderation/actions",
+    asyncHandler(async (req: Request, res: Response) => {
+      const limit = Number(req.query.limit) || 50;
+      const status = req.query.status as string | undefined;
+      const actionType = req.query.actionType as string | undefined;
+      const cursor = req.query.cursor as string | undefined;
+
+      const result = await moderationService.listActions({
+        limit,
+        status,
+        actionType,
+        cursor: cursor ? Number(cursor) : undefined,
+      });
+
+      logger.debug({ count: result.data.length }, "Moderation actions listed");
+      res.json(result);
+    }),
+  );
+
+  return router;
+}