feat: Add Docker infrastructure with Caddy and startup scripts (#25, #26)

Issue #25 - Docker multi-service infrastructure:
- Create docker/Dockerfile with multi-stage build, git support, port 8080
- Create docker/docker-compose.yml with app + Caddy services
- Create docker/Caddyfile for HTTPS termination and reverse proxy
- Create docker/.env.example with configuration template

Issue #26 - Startup scripts and tests:
- Create scripts/start.sh for production startup with env validation
- Create scripts/healthcheck.sh for Docker health checks
- Add health endpoint tests to test_mcp_endpoints.py
- Fix middleware order (HealthCheckBypass must wrap BearerAuth)
- Fix pyproject.toml testpaths to use 'tests' directory
- Update test_config.py for new defaults (0.0.0.0:8080)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker/docker-compose.yml

@@ -0,0 +1,66 @@
+services:
+  # Python MCP Server
+  app:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    image: gitea-mcp-remote:latest
+    container_name: gitea-mcp-remote-app
+    restart: unless-stopped
+    expose:
+      - "8080"
+    environment:
+      # Gitea Configuration (required)
+      - GITEA_URL=${GITEA_URL}
+      - GITEA_TOKEN=${GITEA_TOKEN}
+      - GITEA_OWNER=${GITEA_OWNER}
+      # Optional Gitea config
+      - GITEA_REPO=${GITEA_REPO:-}
+
+      # HTTP Server Configuration
+      - HTTP_HOST=0.0.0.0
+      - HTTP_PORT=8080
+
+      # Authentication (optional - for MCP endpoint)
+      - AUTH_TOKEN=${AUTH_TOKEN:-}
+      - MCP_AUTH_MODE=${MCP_AUTH_MODE:-optional}
+
+      # Tool Filtering (optional)
+      - ENABLED_TOOLS=${ENABLED_TOOLS:-}
+      - DISABLED_TOOLS=${DISABLED_TOOLS:-}
+
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 3s
+      retries: 3
+      start_period: 5s
+
+    networks:
+      - gitea-mcp-network
+
+  # Caddy Reverse Proxy
+  caddy:
+    image: caddy:2-alpine
+    container_name: gitea-mcp-remote-caddy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - caddy_data:/data
+      - caddy_config:/config
+    depends_on:
+      app:
+        condition: service_healthy
+    networks:
+      - gitea-mcp-network
+
+networks:
+  gitea-mcp-network:
+    driver: bridge
+
+volumes:
+  caddy_data:
+  caddy_config: