Initial commit: Multi-service AI agent system

- Frontend: Vite + React + TypeScript chat interface
- Backend: FastAPI gateway with LangGraph routing
- Knowledge Service: ChromaDB RAG with Gitea scraper
- LangGraph Service: Multi-agent orchestration
- Airflow: Scheduled Gitea ingestion DAG
- Documentation: Complete plan and implementation guides

Architecture:
- Modular Docker Compose per service
- External ai-mesh network for communication
- Fast rebuilds with /app/packages pattern
- Intelligent agent routing (no hardcoded keywords)

Services:
- Frontend (5173): React chat UI
- Chat Gateway (8000): FastAPI entry point
- LangGraph (8090): Agent orchestration
- Knowledge (8080): ChromaDB RAG
- Airflow (8081): Scheduled ingestion
- PostgreSQL (5432): Chat history

Excludes: node_modules, .venv, chroma_db, logs, .env files
Includes: All source code, configs, docs, docker files

airflow/docker-compose.yml

@@ -0,0 +1,181 @@
+version: '3.8'
+
+x-airflow-common:
+  &airflow-common
+  image: ${AIRFLOW_IMAGE_NAME:-apache/airflow:2.8.1}
+  environment:
+    &airflow-common-env
+    AIRFLOW__CORE__EXECUTOR: CeleryExecutor
+    AIRFLOW__DATABASE__SQL_ALCHEMY_CONN: postgresql+psycopg2://airflow:airflow@postgres/airflow
+    AIRFLOW__CELERY__RESULT_BACKEND: db+postgresql://airflow:airflow@postgres/airflow
+    AIRFLOW__CELERY__BROKER_URL: redis://:@redis:6379/0
+    AIRFLOW__CORE__FERNET_KEY: ''
+    AIRFLOW__CORE__DAGS_ARE_PAUSED_AT_CREATION: 'true'
+    AIRFLOW__CORE__LOAD_EXAMPLES: 'false'
+    AIRFLOW__API__AUTH_BACKENDS: 'airflow.api.auth.backend.basic_auth,airflow.api.auth.backend.session'
+    AIRFLOW__SCHEDULER__ENABLE_HEALTH_CHECK: 'true'
+    _PIP_ADDITIONAL_REQUIREMENTS: ${_PIP_ADDITIONAL_REQUIREMENTS:-}
+  volumes:
+    - ${AIRFLOW_PROJ_DIR:-.}/dags:/opt/airflow/dags
+    - ${AIRFLOW_PROJ_DIR:-.}/logs:/opt/airflow/logs
+    - ${AIRFLOW_PROJ_DIR:-.}/config:/opt/airflow/config
+    - ${AIRFLOW_PROJ_DIR:-.}/plugins:/opt/airflow/plugins
+  user: "${AIRFLOW_UID:-50000}:0"
+  depends_on:
+    &airflow-common-depends-on
+    redis:
+      condition: service_healthy
+    postgres:
+      condition: service_healthy
+
+services:
+  postgres:
+    image: postgres:13
+    environment:
+      POSTGRES_USER: airflow
+      POSTGRES_PASSWORD: airflow
+      POSTGRES_DB: airflow
+    volumes:
+      - postgres-db-volume:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD", "pg_isready", "-U", "airflow"]
+      interval: 10s
+      retries: 5
+      start_period: 5s
+    restart: always
+    networks:
+      - ai-mesh
+
+  redis:
+    image: redis:latest
+    expose:
+      - 6379
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 30s
+      retries: 50
+      start_period: 30s
+    restart: always
+    networks:
+      - ai-mesh
+
+  airflow-webserver:
+    <<: *airflow-common
+    command: webserver
+    ports:
+      - "8081:8080"
+    healthcheck:
+      test: ["CMD", "curl", "--fail", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+    restart: always
+    depends_on:
+      <<: *airflow-common-depends-on
+      airflow-init:
+        condition: service_completed_successfully
+    networks:
+      - ai-mesh
+
+  airflow-scheduler:
+    <<: *airflow-common
+    command: scheduler
+    healthcheck:
+      test: ["CMD", "curl", "--fail", "http://localhost:8974/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+    restart: always
+    depends_on:
+      <<: *airflow-common-depends-on
+      airflow-init:
+        condition: service_completed_successfully
+    networks:
+      - ai-mesh
+
+  airflow-worker:
+    <<: *airflow-common
+    command: celery worker
+    healthcheck:
+      test:
+        - "CMD-SHELL"
+        - 'celery --app airflow.providers.celery.executors.celery_executor.app inspect ping -d "celery@$${HOSTNAME}" || celery --app airflow.executors.celery_executor.app inspect ping -d "celery@$${HOSTNAME}"'
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+    restart: always
+    depends_on:
+      <<: *airflow-common-depends-on
+      airflow-init:
+        condition: service_completed_successfully
+    networks:
+      - ai-mesh
+
+  airflow-triggerer:
+    <<: *airflow-common
+    command: triggerer
+    healthcheck:
+      test: ["CMD-SHELL", 'airflow jobs check --job-type TriggererJob --hostname "$${HOSTNAME}"']
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+    restart: always
+    depends_on:
+      <<: *airflow-common-depends-on
+      airflow-init:
+        condition: service_completed_successfully
+    networks:
+      - ai-mesh
+
+  airflow-init:
+    <<: *airflow-common
+    entrypoint: /bin/bash
+    command:
+      - -c
+      - |
+        if [[ -z "${AIRFLOW_UID}" ]]; then
+          echo "WARNING!!!: AIRFLOW_UID not set!"
+          echo "Using default UID: 50000"
+          export AIRFLOW_UID=50000
+        fi
+        mkdir -p /sources/logs /sources/dags /sources/plugins
+        chown -R "${AIRFLOW_UID}:0" /sources/{logs,dags,plugins}
+        exec /entrypoint airflow version
+    environment:
+      <<: *airflow-common-env
+      _AIRFLOW_DB_MIGRATE: 'true'
+      _AIRFLOW_WWW_USER_CREATE: 'true'
+      _AIRFLOW_WWW_USER_USERNAME: ${_AIRFLOW_WWW_USER_USERNAME:-airflow}
+      _AIRFLOW_WWW_USER_PASSWORD: ${_AIRFLOW_WWW_USER_PASSWORD:-airflow}
+    user: "0:0"
+    volumes:
+      - ${AIRFLOW_PROJ_DIR:-.}:/sources
+    networks:
+      - ai-mesh
+
+  airflow-cli:
+    <<: *airflow-common
+    profiles:
+      - debug
+    environment:
+      <<: *airflow-common-env
+      CONNECTION_CHECK_MAX_COUNT: "0"
+    command:
+      - bash
+      - -c
+      - airflow
+    networks:
+      - ai-mesh
+
+volumes:
+  postgres-db-volume:
+
+networks:
+  ai-mesh:
+    external: true
+