Add MCP HTTP/SSE server and complete n8n integration

Major Changes:
- Implemented MCP HTTP/SSE transport server for n8n and web clients
- Created mcp_server/http_server.py with FastAPI for JSON-RPC 2.0 over HTTP
- Added health check endpoint (/health) for container monitoring
- Refactored mcp-server/ to mcp_server/ (Python module structure)
- Updated Dockerfile.mcp to run HTTP server with health checks

MCP Server Features:
- 7 memory tools exposed via MCP (add, search, get, update, delete)
- HTTP/SSE transport on port 8765 for n8n integration
- stdio transport for Claude Code integration
- JSON-RPC 2.0 protocol implementation
- CORS support for web clients

n8n Integration:
- Successfully tested with AI Agent workflows
- MCP Client Tool configuration documented
- Working webhook endpoint tested and verified
- System prompt optimized for automatic user_id usage

Documentation:
- Created comprehensive Mintlify documentation site
- Added docs/mcp/introduction.mdx - MCP server overview
- Added docs/mcp/installation.mdx - Installation guide
- Added docs/mcp/tools.mdx - Complete tool reference
- Added docs/examples/n8n.mdx - n8n integration guide
- Added docs/examples/claude-code.mdx - Claude Code setup
- Updated README.md with MCP HTTP server info
- Updated roadmap to mark Phase 1 as complete

Bug Fixes:
- Fixed synchronized delete operations across Supabase and Neo4j
- Updated memory_service.py with proper error handling
- Fixed Neo4j connection issues in delete operations

Configuration:
- Added MCP_HOST and MCP_PORT environment variables
- Updated .env.example with MCP server configuration
- Updated docker-compose.yml with MCP container health checks

Testing:
- Added test scripts for MCP HTTP endpoint verification
- Created test workflows in n8n
- Verified all 7 memory tools working correctly
- Tested synchronized operations across both stores

Version: 1.0.0
Status: Phase 1 Complete - Production Ready

🤖 Generated with Claude Code

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

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   # Neo4j Graph Database
   neo4j:
@@ -78,6 +76,7 @@ services:
       - NEO4J_URI=neo4j://neo4j:7687
       - NEO4J_USER=${NEO4J_USER:-neo4j}
       - NEO4J_PASSWORD=${NEO4J_PASSWORD}
+      - API_KEY=${API_KEY}
       - MCP_HOST=0.0.0.0
       - MCP_PORT=8765
       - MEM0_COLLECTION_NAME=${MEM0_COLLECTION_NAME:-t6_memories}