feat: Update all production configs for dedicated PostgreSQL server

- PostgreSQL now on dedicated server: 10.0.0.207:5432
- Database: parentflow (user: postgres, password: a3ppq)
- Removed PostgreSQL from docker-compose.production.yml
- Updated start-production.sh to check PostgreSQL connectivity
- Updated migration scripts to use dedicated server
- Created .env.admin.example for admin service configuration
- Updated admin dashboard docs with PostgreSQL details
- Redis, MongoDB, MinIO remain as Docker containers on 10.0.0.240

Infrastructure:
- Application Server: 10.0.0.240 (PM2 + Docker services)
- Database Server: 10.0.0.207 (PostgreSQL only)
- Admin Server: 10.0.0.241 (future deployment)
- Nginx Proxy: Separate server with SSL configured

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

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

docker-compose.production.yml

@@ -1,26 +1,13 @@
 version: '3.8'
 
+# Production Docker Compose for ParentFlow
+# PostgreSQL is on dedicated server: 10.0.0.207
+# These services run on application server: 10.0.0.240
+
 services:
-  postgres:
-    image: pgvector/pgvector:pg15
-    container_name: parentflow-postgres-prod
-    environment:
-      POSTGRES_DB: parentflow_production
-      POSTGRES_USER: parentflow_user
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-parentflow_secure_password_2024}
-    ports:
-      - "5432:5432"
-    volumes:
-      - postgres_prod_data:/var/lib/postgresql/data
-      - ./maternal-app/maternal-app-backend/src/database/migrations:/docker-entrypoint-initdb.d:ro
-    networks:
-      - parentflow-network
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U parentflow_user -d parentflow_production"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
+  # PostgreSQL removed - using dedicated server
+  # Connection: postgresql://postgres:a3ppq@10.0.0.207:5432/parentflow
+  # Migrations should be run directly on the database server
 
   redis:
     image: redis:7-alpine
@@ -86,8 +73,6 @@ networks:
     driver: bridge
 
 volumes:
-  postgres_prod_data:
-    driver: local
   redis_prod_data:
     driver: local
   mongodb_prod_data: