Initial commit: cross-platform MiMo-to-Anthropic local gateway

Adds a FastAPI-based local proxy that remaps Claude model IDs to Xiaomi
MiMo and forwards requests to MiMo's Anthropic-compatible API. Includes
launchers for Windows (start.ps1), macOS/Linux (start.sh), and Docker.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,4 @@
+MIMO_API_KEY=your_xiaomi_mimo_api_key_here
+MIMO_BASE_URL=https://api.xiaomimimo.com/anthropic
+HOST=127.0.0.1
+PORT=8787