feat(ai-services): add Python FastAPI AI/ML services container

Create libs/ai-services/ with FastAPI app providing:
- POST /avm/predict — XGBoost-backed property price prediction (heuristic fallback)
- POST /avm/extract-features — Vietnamese NLP feature extraction from listing text
- POST /moderation/check — content moderation with rule-based flagging
- GET /health — health check endpoint

Includes Dockerfile (Python 3.12), docker-compose integration, Pydantic models,
and 9 passing tests covering all endpoints.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docker-compose.yml

@@ -81,6 +81,76 @@ services:
     networks:
       - goodgo-net
 
+  ai-services:
+    build:
+      context: ./libs/ai-services
+      dockerfile: Dockerfile
+    container_name: goodgo-ai-services
+    restart: unless-stopped
+    ports:
+      - '${AI_SERVICES_PORT:-8000}:8000'
+    environment:
+      AI_DEBUG: ${AI_DEBUG:-false}
+      AI_LOG_LEVEL: ${AI_LOG_LEVEL:-info}
+    healthcheck:
+      test: ['CMD', 'python', '-c', 'import httpx; httpx.get("http://localhost:8000/health").raise_for_status()']
+      interval: 30s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
+    networks:
+      - goodgo-net
+
+  prometheus:
+    image: prom/prometheus:v2.51.0
+    container_name: goodgo-prometheus
+    restart: unless-stopped
+    ports:
+      - '${PROMETHEUS_PORT:-9090}:9090'
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.retention.time=15d'
+      - '--web.enable-lifecycle'
+    volumes:
+      - ./monitoring/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - prometheus_data:/prometheus
+    extra_hosts:
+      - 'host.docker.internal:host-gateway'
+    healthcheck:
+      test: ['CMD', 'wget', '--spider', '-q', 'http://localhost:9090/-/healthy']
+      interval: 15s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+    networks:
+      - goodgo-net
+
+  grafana:
+    image: grafana/grafana:10.4.1
+    container_name: goodgo-grafana
+    restart: unless-stopped
+    ports:
+      - '${GRAFANA_PORT:-3002}:3000'
+    environment:
+      GF_SECURITY_ADMIN_USER: ${GRAFANA_ADMIN_USER:-admin}
+      GF_SECURITY_ADMIN_PASSWORD: ${GRAFANA_ADMIN_PASSWORD:-admin}
+      GF_USERS_ALLOW_SIGN_UP: 'false'
+    volumes:
+      - ./monitoring/grafana/provisioning:/etc/grafana/provisioning:ro
+      - ./monitoring/grafana/dashboards:/var/lib/grafana/dashboards:ro
+      - grafana_data:/var/lib/grafana
+    depends_on:
+      prometheus:
+        condition: service_healthy
+    healthcheck:
+      test: ['CMD', 'wget', '--spider', '-q', 'http://localhost:3000/api/health']
+      interval: 15s
+      timeout: 5s
+      retries: 3
+      start_period: 15s
+    networks:
+      - goodgo-net
+
 volumes:
   pgdata:
     driver: local
@@ -90,6 +160,10 @@ volumes:
     driver: local
   minio_data:
     driver: local
+  prometheus_data:
+    driver: local
+  grafana_data:
+    driver: local
 
 networks:
   goodgo-net: