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/tests/placeholder.test.ts

@@ -257,7 +257,7 @@ describe("Config validation", () => {
 // ═══════════════════════════════════════════════════════════════════════════════
 // 5. Pure function modules
 // ═══════════════════════════════════════════════════════════════════════════════
-import { sniffImageMimeType } from "../src/modules/ai-moderation/imageMimeSniffer.js";
+import { sniffImageMimeType } from "../src/modules/ai-moderation/mediaAnalysisClient.js";
 
 describe("sniffImageMimeType", () => {
   function buf(...bytes: number[]): Buffer {
@@ -320,7 +320,7 @@ import {
   deriveRecommendedAction,
   deriveSeverity,
   hasDeferralAnalysis,
-} from "../src/modules/ai-moderation/severityDeriver.js";
+} from "../src/modules/ai-moderation/moderationResponseParser.js";
 
 describe("severityDeriver", () => {
   describe("clampScore", () => {
@@ -411,7 +411,7 @@ describe("severityDeriver", () => {
   });
 });
 
-import { extractJson } from "../src/modules/ai-moderation/jsonExtractor.js";
+import { extractJson } from "../src/modules/ai-moderation/moderationResponseParser.js";
 
 describe("extractJson", () => {
   it("extracts from plain JSON string", () => {