refactor: split monolith into 3 microservices (frontend, backend, discord-gateway)

- Extract services into services/{frontend,backend,discord-gateway}
- Create packages/shared/ for shared logger, errors, utils, types
- Setup Modular MVC pattern in backend (controller→service→repository)
- Setup event-driven architecture in discord-gateway with Redis pub/sub
- Move Docker files to infra/docker/ with per-service Dockerfiles
- Update docker-compose.yml to use Traefik-only routing (no port exposes)
- Update GitHub Actions deploy workflow for multi-service matrix build
- Fix all import paths and resolve type errors across all services
- All 3 services pass tsc --noEmit clean

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/frontend/src/shared/ws/events.ts

@@ -0,0 +1,28 @@
+// ─── Typed event map for WebSocket events ────────────────────────────────────
+
+export interface WsEventMap {
+  message_created: { data: unknown };
+  message_updated: { data: unknown };
+  message_deleted: { data: { id: string } };
+  message_analyzed: { data: unknown };
+  attachment_uploaded: Record<string, never>;
+  user_state: { users: unknown[] };
+  ui_state: { state: unknown };
+  media_state: { state: unknown };
+  voice_recording_uploaded: { data: unknown };
+}
+
+export type WsEventType = keyof WsEventMap;
+
+export function parseWsMessage(
+  raw: string,
+): { type: WsEventType; payload: Record<string, unknown> } | null {
+  try {
+    const parsed = JSON.parse(raw);
+    if (!parsed.type) return null;
+    const { type, ...rest } = parsed;
+    return { type: type as WsEventType, payload: rest };
+  } catch {
+    return null;
+  }
+}