fix(security): harden backup path validation and hybrid mcp params

docs(readme): add MCP setup guide for coding agents

fix(mcp): implement missing hybrid mode handlers for LobeHub compatibility

fix(security): implement 5 security edge case handlers with comprehensive protection

Fix Vitest fs.lstat mock in backup-service tests

fix(security): implement 5 P0 critical security fixes

docs: update documentation and architecture diagrams for v2.2.0

feat: implement native SSE and hybrid Streamable HTTP support for LobeHub compatibility

fix: handle edge cases in backup, API, and error handling

fix: add edge case fixes and security improvements

docs: update README badges to v2.1.0

chore: bump version to 2.1.0

docs: enhance Dockerfile comments for SSE configuration

docs: update README and project docs for SSE support

feat: add SSE client examples for browser and Node.js