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/command-handler/commandHandler.ts

@@ -53,7 +53,13 @@ export class CommandHandler {
   private moderationHandler!: ModerationHandler;
 
   constructor() {
-    this.redisSub = new Redis(config.REDIS_URL);
+    // Dedicated Redis connection needed because: Redis requires a dedicated
+    // connection for SUBSCRIBE mode — a subscribed connection cannot perform
+    // publish/set operations. This connection listens on backend:command for
+    // inbound requests from the backend.
+    this.redisSub = new Redis(config.REDIS_URL); // Dedicated Redis connection needed because: Redis requires a dedicated
+    // PUBLISH connection (cannot share with redisSub which is in SUBSCRIBE mode).
+    // Handles command reply publishing and voice/media status key updates.
     this.redisPub = new Redis(config.REDIS_URL);
 
     this.redisSub.on("error", (err) => {