[CHORE]: Add time server (and configure it post-deploy) to docker-compose.yaml

Description

Add the fast-time-server MCP service to the optional MCP servers section of docker-compose.yaml with automatic post-deployment registration to the MCP Gateway.

Tasks

• Add fast_time_server service block to OPTIONAL MCP SERVERS section
  • Use image: ghcr.io/ibm/fast-time-server:latest
  • Configure SSE transport mode on port 8888->8080
  • Include in mcpnet network
• Add register_fast_time one-shot service for automatic registration
  • Install mcp-contextforge-gateway via pip
  • Generate JWT token using mcpgateway.utils.create_jwt_token
  • Wait for fast_time_server health endpoint
  • Register with gateway at http://gateway:4444/gateways
  • Create virtual server with time tools
  • Make idempotent (check for existing registrations)
• Test deployment with docker-compose up -d fast_time_server register_fast_time
• Verify registration via gateway API

Acceptance Criteria

• fast_time_server starts successfully on port 8888
• Registration completes without errors
• Service is accessible via MCP Gateway
• Re-running registration doesn't create duplicates