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/modules/messages/messages.routes.ts

@@ -1,7 +1,7 @@
 import { createChildLogger } from "@bete/shared/logger";
 import type { Request, Response, Router } from "express";
 import express from "express";
-import { asyncHandler } from "../../shared/middlewares/index.js";
+import { asyncHandler, validateBody } from "../../shared/middlewares/index.js";
 import {
   handleGetAttachmentsByChannel,
   handleGetImageMessages,
@@ -9,6 +9,7 @@ import {
   handleGetMessagesByChannel,
   handleListMessages,
 } from "./messages.controller.js";
+import { reanalyzeBatchSchema } from "./messages.schema.js";
 import { messagesService } from "./messages.service.js";
 
 const logger = createChildLogger("messages.routes");
@@ -55,8 +56,9 @@ export function createMessagesRouter(): Router {
   // is not captured as an :id param.
   router.post(
     "/messages/reanalyze-batch",
+    validateBody(reanalyzeBatchSchema),
     asyncHandler(async (req: Request, res: Response) => {
-      const { guildId, channelId, messageIds } = (req.body ?? {}) as {
+      const { guildId, channelId, messageIds } = req.body as {
         guildId?: string;
         channelId?: string;
         messageIds?: string[];