refactor: large codebase cleanup - consolidate schemas, migrate to Drizzle ORM, extract frontend components, modernize Docker builds

- Consolidate all DB schema definitions into packages/shared as single source of truth
- Migrate backend from raw SQL to Drizzle ORM across all modules
- Extract frontend inline UI into separate component files
- Refactor discord-gateway circuitBreaker into conversationState + moderationState
- Convert messageStore to Proxy singleton pattern
- Add validateBody/validateQuery middleware + Zod schemas for API endpoints
- Modernize Docker builds with multi-stage + pnpm deploy
- Migrate CI/CD from deployment to image-based pipeline
- Remove 60+ unused/dead files (~15K lines)
- Update color scheme from sky-blue to teal-cyan
- Move DB connection management to @bete/shared/database

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/discord-gateway/src/modules/ai-moderation/mediaCache.ts

@@ -0,0 +1,51 @@
+/**
+ * mediaCache.ts
+ *
+ * LRU cache and DB-backed caching layer for vision analysis results,
+ * including phash-based deduplication and distributed locking.
+ */
+import { LRUCache } from "lru-cache";
+import {
+  acquireMediaAnalysisLock,
+  computeImagePhash,
+  deleteCachedMediaAnalysis,
+  getCachedMediaAnalysis,
+  getCachedMediaByPhash,
+  makeCustomEmojiCacheKey,
+  makeImageCacheKey,
+  makeStickerCacheKey,
+  upsertCachedMediaAnalysis,
+  upsertCachedMediaByPhash,
+} from "./textCacheStore.js";
+
+export {
+  acquireMediaAnalysisLock,
+  computeImagePhash,
+  deleteCachedMediaAnalysis,
+  getCachedMediaAnalysis,
+  getCachedMediaByPhash,
+  makeCustomEmojiCacheKey,
+  makeImageCacheKey,
+  makeStickerCacheKey,
+  upsertCachedMediaAnalysis,
+  upsertCachedMediaByPhash,
+};
+
+/** Convenience alias for upsertCachedMediaAnalysis. */
+export const setCachedMediaAnalysis = upsertCachedMediaAnalysis;
+
+/** In-memory LRU cache for vision analysis text results. */
+export const visionLruCache = new LRUCache<string, string>({
+  max: 500,
+  ttl: 24 * 60 * 60 * 1000,
+});
+
+/** Deduplicate in-flight vision analysis calls per cache key. */
+export const inFlightVisionCalls = new Map<string, Promise<string>>();
+
+/**
+ * Sentinel value returned when image download or vision analysis fails
+ * after exhausting all retries.
+ */
+export const FAILED_ANALYSIS_PREFIX =
+  "GAGAL DIANALISIS — gambar tidak dapat diunduh atau vision API gagal setelah 3x percobaan. JANGAN mengasumsikan gambar aman hanya karena gagal dianalisis. Gunakan metadata URL/nama file saja sebagai petunjuk.";