feat: configure context7-mcp and proxmox-mcp as stdio servers

- Set context7-mcp restart: "no" for on-demand execution
- Add context7-mcp to crush.json mcp configuration
- Fix proxmox-mcp Dockerfile to use python module directly
- Update proxmox-mcp entrypoint to "python -m proxmox_mcp.server"
- Add git dependency for proxmox-mcp git+ dependencies
- Remove --frozen flag (no lock file available)

docker-compose.yml

@@ -88,7 +88,7 @@ services:
     image: kneldevstack-aimiddleware-proxmox-mcp
     build:
       context: ./vendor/ProxmoxMCP
-      dockerfile: Dockerfile
+      dockerfile: ../../dockerfiles/proxmox-mcp/Dockerfile
     container_name: kneldevstack-aimiddleware-proxmox-mcp
     restart: unless-stopped
     environment:
@@ -97,7 +97,6 @@ services:
       - PROXMOX_USER=${PROXMOX_USER}
       - PROXMOX_TOKEN=${PROXMOX_TOKEN}
       - PROXMOX_NODE=${PROXMOX_NODE}
-    command: ["uvx", "proxmox-mcp"]
     profiles:
       - ops
 
@@ -149,13 +148,14 @@ services:
       - dev
 
   # Context7 MCP - Documentation framework
+  # NOTE: This is a stdio-based MCP server, run on-demand by Crush via docker run
   context7-mcp:
     image: kneldevstack-aimiddleware-context7-mcp
     build:
       context: ./vendor/context7
       dockerfile: ../../dockerfiles/context7/Dockerfile
     container_name: kneldevstack-aimiddleware-context7-mcp
-    restart: unless-stopped
+    restart: "no"
     environment:
       - UPSTASH_REDIS_REST_URL=${UPSTASH_REDIS_REST_URL}
       - UPSTASH_REDIS_REST_TOKEN=${UPSTASH_REDIS_REST_TOKEN}