llama.cpp b9216

ui: Refactor models store, MCP service, and gate logs behind VITE_DEBUG (#23236)

• refactor: Scope console logs to DEV + VITE_DEBUG env vars

• refactor: skip MCP proxy probe when no server requires it

• refactor: suppress expected disconnect errors during MCP client shutdown

• refactor: Deduplicate requests

• refactor: deduplicate model fetching across ROUTER and MODEL modes

• refactor: Clean up models logic

• chore: Add .env.example file

• refactor: replace client-side CORS proxy probe with server status flag

• refactor: Post-review fixes

• test: add vitest client setup with API fetch mocks