Add health checks for zero-downtime deployments

Critical changes for production stability:

1. Add healthchecks to all services:
   - app: curl to /health endpoint (10s interval, 5s start period)
   - postgres: pg_isready check (5s interval)
   - redis: redis-cli ping check (5s interval)

2. Use depends_on with health conditions:
   - Ensures postgres/redis are fully ready before app starts
   - Prevents connection errors during startup

3. Remove hardcoded container_name:
   - Prevents name collisions between deployments
   - Allows Coolify to manage container names

Why this matters:
- Without healthchecks: Coolify kills old container → builds new → 502 gap
- With healthchecks: Coolify builds new → waits for healthy → kills old → zero downtime

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docker-compose.yml

@@ -3,7 +3,6 @@ version: '3.8'
 services:
   app:
     build: .
-    container_name: template-001-app
     restart: unless-stopped
     environment:
       - NODE_ENV=production
@@ -16,12 +15,20 @@ services:
       - REDIS_HOST=redis
       - REDIS_PORT=6379
     depends_on:
-      - postgres
+      postgres:
-      - redis
+        condition: service_healthy
+      redis:
+        condition: service_healthy
     networks:
       - app-network
     expose:
       - "3000"
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3000/health"]
+      interval: 10s
+      timeout: 3s
+      start_period: 5s
+      retries: 2
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.template-001.rule=Host(`template-001.startanaicompany.com`)"
@@ -32,7 +39,6 @@ services:
 
   postgres:
     image: postgres:15-alpine
-    container_name: template-001-postgres
     restart: unless-stopped
     environment:
       - POSTGRES_USER=postgres
@@ -44,10 +50,14 @@ services:
       - app-network
     expose:
       - "5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 3s
+      retries: 3
 
   redis:
     image: redis:7-alpine
-    container_name: template-001-redis
     restart: unless-stopped
     command: redis-server --appendonly yes
     volumes:
@@ -56,6 +66,11 @@ services:
       - app-network
     expose:
       - "6379"
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 3
 
 volumes:
   postgres-data: