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/backend/src/e2e.test.ts

@@ -1,10 +1,10 @@
 /**
  * E2E API tests — runs against a running backend instance.
- * Usage: vitest run  (or: API_BASE=http://localhost:3001 vitest run)
+ * Usage: API_BASE=http://localhost:3001 vitest run
  */
 import { describe, expect, it } from "vitest";
 
-const BASE = process.env.API_BASE ?? "https://imphnen.asepharyana.my.id/api";
+const BASE = process.env.API_BASE ?? "http://localhost:3001/api";
 
 async function api(path: string, init?: RequestInit) {
   const res = await fetch(`${BASE}${path}`, {