chore: initial commit

- Track MiroSociety source: backend (FastAPI), frontend (Vue3/Vite), docs, configs.
- Add start.sh / deploy.sh for local dev (uv venv + npm + dev servers on 31400/31401).
- Fix pyproject.toml: missing httpx dependency.
- Tighten .gitignore: .env, .venv, node_modules, data/, *.log, uv.lock, frontend/dist, etcd.

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

backend/app/api/presets.py

@@ -0,0 +1,9 @@
+from fastapi import APIRouter
+from app.presets import PRESETS
+
+router = APIRouter(prefix="/api")
+
+
+@router.get("/presets")
+async def get_presets():
+    return {"presets": PRESETS}