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>

requirements.txt

@@ -1,10 +1,11 @@
 # Core Memory System
-mem0ai[graph]==0.1.*
+# Requires >=0.1.118 for get_all() and search() dict return format fix
+mem0ai[graph]>=0.1.118,<0.2.0
 
 # Web Framework
 fastapi==0.115.*
 uvicorn[standard]==0.32.*
-pydantic==2.9.*
+pydantic>=2.7.3,<3.0
 pydantic-settings==2.6.*
 
 # MCP Server
@@ -13,9 +14,11 @@ mcp==1.3.*
 # Database Drivers
 psycopg2-binary==2.9.*
 neo4j==5.26.*
+vecs==0.4.*
 
 # OpenAI
-openai==1.58.*
+# mem0ai 0.1.118 requires openai<1.110.0,>=1.90.0
+openai>=1.90.0,<1.110.0
 
 # Utilities
 python-dotenv==1.0.*