feat: add Docker container management for MCP servers

McpOrchestrator interface with DockerContainerManager implementation,
instance service for lifecycle management, instance API routes,
and docker-compose with mcpd service. 127 tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy/docker-compose.yml

@@ -15,6 +15,35 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
+    networks:
+      - mcpctl
+
+  mcpd:
+    build:
+      context: ..
+      dockerfile: deploy/Dockerfile.mcpd
+    container_name: mcpctl-mcpd
+    ports:
+      - "3100:3100"
+    environment:
+      DATABASE_URL: postgresql://mcpctl:mcpctl_dev@postgres:5432/mcpctl
+      PORT: "3100"
+      HOST: "0.0.0.0"
+      LOG_LEVEL: info
+    depends_on:
+      postgres:
+        condition: service_healthy
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    networks:
+      - mcpctl
+      - mcp-servers
+    healthcheck:
+      test: ["CMD-SHELL", "wget -q --spider http://localhost:3100/healthz || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
 
   postgres-test:
     image: postgres:16-alpine
@@ -32,6 +61,15 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
+    profiles:
+      - test
+
+networks:
+  mcpctl:
+    driver: bridge
+  mcp-servers:
+    driver: bridge
+    internal: true
 
 volumes:
   mcpctl-pgdata: