infra: add Docker Compose setup for local development

- Configure PostgreSQL 18 and Valkey 9.1 services
- Create multi-stage Dockerfiles for API and Web apps
- Set up pnpm workspace support in container builds
- Configure hot reload via volume mounts for both services
- Add healthchecks for service orchestration
- Support dev/production stage targets (tsx watch vs compiled)

packages/db/package.json

@@ -3,6 +3,9 @@
   "version": "1.0.0",
   "private": true,
   "type": "module",
+  "scripts": {
+    "build": "tsc"
+  },
   "dependencies": {
     "dotenv": "^17.3.1",
     "drizzle-orm": "^0.45.1",