chore: add Coolify deployment scaffolding (Dockerfiles, prod compose, git hygiene)

- apps/api/Dockerfile: build NestJS, run prisma migrate deploy on start
- apps/web/Dockerfile + nginx.conf: build Vite, serve static, proxy /api -> api
- docker-compose.coolify.yml: full prod stack (postgres, redis, minio, keycloak, api, web)
- .dockerignore / .gitignore / .gitattributes

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

.env.example

@@ -0,0 +1,26 @@
+# PostgreSQL
+DATABASE_URL="postgresql://hrm:hrm_password@localhost:5432/hrm_medpark?schema=public"
+
+# Keycloak
+KEYCLOAK_URL="http://localhost:8080"
+KEYCLOAK_REALM="medpark"
+KEYCLOAK_CLIENT_ID="hrm-api"
+KEYCLOAK_CLIENT_SECRET="change-me"
+
+# Redis (BullMQ)
+REDIS_HOST="localhost"
+REDIS_PORT=6379
+
+# MinIO (S3)
+MINIO_ENDPOINT="localhost"
+MINIO_PORT=9000
+MINIO_ACCESS_KEY="minioadmin"
+MINIO_SECRET_KEY="minioadmin"
+MINIO_BUCKET="hrm-docs"
+
+# n8n webhook base URL
+N8N_WEBHOOK_BASE="http://localhost:5678/webhook"
+
+# App
+PORT=3001
+NODE_ENV="development"