feat(2.0): Phase 0 — Greenfield-Skeleton (FastAPI + React/shadcn)

Backend: FastAPI mit /api/health + /api/models (read-only aus llama-swap
config, Logik aus v1 portiert). Frontend: Vite + React + Tailwind v4 +
shadcn-Style App-Shell mit Cmd+K, Dark-default, PWA-Manifest; Modelle-View
live aus /api/models. Deploy-Geruest (systemd-Unit :9001, build/deploy-
Skripte, NOPASSWD-sudoers, kein Klartext-Passwort).

Verifiziert: Backend-Endpunkte + Frontend-Build + gerenderte Shell.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app.py

@@ -0,0 +1,50 @@
+"""
+Mission Control 2.0 — dünner FastAPI-Einstieg.
+
+Hängt die Router ein, liefert (in Prod) das gebaute React-Frontend aus und
+setzt eine no-cache-Middleware. Im Dev läuft das Frontend über den Vite-Dev-
+Server (proxyt /api hierher), daher CORS für localhost offen.
+"""
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import FileResponse
+from fastapi.staticfiles import StaticFiles
+from starlette.requests import Request
+
+from config import FRONTEND_DIST, VERSION
+from routers import health, models
+
+app = FastAPI(title="Mission Control 2.0", version=VERSION)
+
+# Dev: Vite-Dev-Server (5173) ruft das Backend per /api auf.
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.middleware("http")
+async def no_cache(request: Request, call_next):
+    resp = await call_next(request)
+    if request.url.path.startswith("/api"):
+        resp.headers["Cache-Control"] = "no-cache"
+    return resp
+
+
+app.include_router(health.router)
+app.include_router(models.router)
+
+
+# Prod: gebautes Frontend ausliefern (falls vorhanden). SPA-Fallback auf index.html.
+if FRONTEND_DIST.exists():
+    app.mount("/assets", StaticFiles(directory=FRONTEND_DIST / "assets"), name="assets")
+
+    @app.get("/{full_path:path}")
+    def spa(full_path: str):
+        index = FRONTEND_DIST / "index.html"
+        if index.exists():
+            return FileResponse(index)
+        return {"detail": "frontend not built"}