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/moderationBuilders.ts

@@ -5,7 +5,7 @@
  * Used by both mediaAnalysisClient.ts and moderationOrchestrator.ts.
  */
 
-import { getMessageById } from "../message-capture/messageStore.js";
+import { messageStore } from "../message-capture/messageStore.js";
 import type { MessageRecord } from "../message-capture/types.js";
 
 /** Simple XML-escaping for content text. */
@@ -51,7 +51,9 @@ export async function buildReferenceXml(msg: MessageRecord): Promise<string> {
   if (msg.reference_message_id) {
     // 1. Try DB first — works for messages captured in the same server
     try {
-      const parent = await getMessageById(msg.reference_message_id);
+      const parent = await messageStore.getMessageById(
+        msg.reference_message_id,
+      );
       if (parent) {
         const parentText = parent.edited_content ?? parent.content;
         parentContent = parentText.slice(0, 500);