Provided Full Supports for SSE and Streamable-HTTP Transports and Refactor README

[RyanNg1403]

Summary

• Add first-class MCP server support for SSE and Streamable-HTTP transports
• Refactor README to be concise and push deep-dive details into dedicated docs in @docs/

What’s new

• SSE transport
  • New dedicated server: src/app/mcp/mcp_sse_server.ts
  • API mode integration: GET /api/mcp/sse (establish SSE), POST /api/mcp?sessionId=... (messages)
  • CLI: cipher --mode mcp --mcp-transport-type sse --mcp-port 3000
  • API mode: cipher --mode api --mcp-transport-type sse --port 3001
• Streamable-HTTP transport
  • New server: src/app/mcp/mcp_streamable_http_server.ts
  • CLI: cipher --mode mcp --mcp-transport-type streamable-http --mcp-port 3001

CLI and config

• Defaults: cipher --mode mcp uses stdio; --mcp-transport-type selects stdio | sse | streamable-http
• Exact-optional typing compliance for transport options; consistent returns in route handlers

Documentation

• README streamlined:
  • Introduced dropdowns for CLI usage, basic config, and env vars
  • Light emoji pass for friendliness (kept minimal)
  • Pointed readers to specific, expanded guides in @docs/ (CLI Reference, MCP Integration, Vector Stores, etc.)
• CLI Reference updated with accurate provider list and HTTP/SSE endpoints

How to test

• SSE (stdio remains default)
  • cipher --mode mcp --mcp-transport-type sse --mcp-port 3000
  • Or via API mode: cipher --mode api --mcp-transport-type sse --port 3001
• Streamable-HTTP
  • cipher --mode mcp --mcp-transport-type streamable-http --mcp-port 3001

Impact

• Enables HTTP-based MCP connectivity for IDEs/clients that prefer SSE or streamable patterns
• Improves onboarding and doc navigation without losing depth (now centralized in @docs/)