docs: restore MCP client blurbs and LangChain LLM guide. Home links Cursor, Claude, and LangChain; local LLM page reframed with Bonsai as optional example. Co-authored-by: Cursor <cursoragent@cursor.com>
Add bilingual use-case hub pages and Home links. Document six MCP bridge patterns (Obsidian, bake-offs, research agents, distillation, session experiments, content pipelines) with ToS framing. Co-authored-by: Cursor <cursoragent@cursor.com>