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>

packages/shared/src/logger/index.ts

@@ -0,0 +1,25 @@
+import pino from "pino";
+
+export type Logger = ReturnType<typeof createLogger>;
+
+export function createLogger(context: string) {
+  return pino({
+    name: context,
+    level: process.env.LOG_LEVEL || "info",
+    transport:
+      process.env.NODE_ENV === "development"
+        ? {
+            target: "pino-pretty",
+            options: {
+              colorize: true,
+              translateTime: "SYS:standard",
+              ignore: "pid,hostname",
+            },
+          }
+        : undefined,
+  } as pino.LoggerOptions);
+}
+
+export function createChildLogger(context: string) {
+  return createLogger(context);
+}