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>

.gitignore

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+.env
+__pycache__/
+*.py[cod]
+.venv/
+venv/