feat(2.0): Phase 1 — Engine + Routing (Herzstueck)

Backend-Services: fit/caps/sources (portiert), discover (live HF + Fit +
Caps + ranked recommendation), llama-swap write/register + groups (Ko-
Residenz swap:false), LiteLLM-Gateway-Config + gateway-Service (model:auto +
Fallbacks). Router: discover/fit/register/groups/routing; health zeigt
gateway_reachable. Frontend: Modelle&Routing mit Caps-Chips, Fit-Badges,
Discover-Tab (live), Routing-View.

Lokal verifiziert: Backend-Smoke (alle Endpunkte) + Frontend-Build +
Browser (Shell, Discover, Caps/Fit). Box-Verifikation offen.

Docs: README + docs/STATUS.md (Phasen-Tracker + Resume-Guide).

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

backend/routers/routing.py

@@ -0,0 +1,28 @@
+"""Routing-Endpoints: Gateway-Übersicht (welcher Alias = fast/heavy/…) + Mapping setzen."""
+
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+
+from services import gateway
+
+router = APIRouter(prefix="/api")
+
+
+@router.get("/routing")
+def routing() -> dict:
+    return {**gateway.routing_summary(), "gateway_reachable": gateway.gateway_reachable()}
+
+
+class RouteReq(BaseModel):
+    name: str          # Gateway-Modellname, z.B. "fast" / "heavy" / "vision" / "coder"
+    target_alias: str  # llama-swap-Alias, der bedient wird
+    api_base: str = "http://127.0.0.1:8080/v1"
+
+
+@router.put("/routing/route")
+def set_route(req: RouteReq) -> dict:
+    try:
+        gateway.set_route(req.name, req.target_alias, api_base=req.api_base)
+    except Exception as exc:  # noqa: BLE001
+        raise HTTPException(500, str(exc))
+    return {"ok": True}