feat(analytics): add daily trend and activity heatmap endpoints, and implement corresponding frontend components

- Added new API endpoints for daily trend data and activity heatmap in analyticsRoutes.ts.
- Created new frontend components: ActivityChart, ControlBar, Heatmap, SummaryCards, TopicList, TrendChart, UserTable, and ViolatorTable for displaying analytics data.
- Implemented loading and empty states in the new components.
- Enhanced the existing moderation tests with remote fallback handling for Indonesian text normalization.

tests/moderation/indonesianTextNormalizer.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it } from "vitest";
+import { afterAll, afterEach, describe, expect, it } from "vitest";
 import {
   buildModerationTextEvidence,
   detectIndonesianBadwords,
@@ -6,6 +6,26 @@ import {
   normalizeDiscordCustomEmoji,
   normalizeIndonesianSlang,
 } from "../../src/moderation/indonesianTextNormalizer";
+import { config } from "../../src/config";
+
+const originalNemotronKey = config.NVIDIA_NEMOTRON_API_KEY;
+const originalPrimaryAiKey = config.AI_LLM_API_KEY;
+
+function disableRemoteModeration(): void {
+  config.NVIDIA_NEMOTRON_API_KEY = undefined;
+  config.AI_LLM_API_KEY = undefined;
+}
+
+disableRemoteModeration();
+
+afterEach(() => {
+  disableRemoteModeration();
+});
+
+afterAll(() => {
+  config.NVIDIA_NEMOTRON_API_KEY = originalNemotronKey;
+  config.AI_LLM_API_KEY = originalPrimaryAiKey;
+});
 
 describe("normalizeDiscordCustomEmoji", () => {
   it("replaces static custom emoji", () => {