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>

frontend/src/lib/api.ts

@@ -0,0 +1,30 @@
+// Schmaler Fetch-Helfer gegen das MC-2-Backend (/api/*).
+
+export async function api<T = unknown>(path: string, init?: RequestInit): Promise<T> {
+  const res = await fetch(path, {
+    headers: { "Content-Type": "application/json" },
+    ...init,
+  })
+  if (!res.ok) throw new Error(`${res.status} ${res.statusText}`)
+  return res.json() as Promise<T>
+}
+
+export interface ModelInfo {
+  name: string
+  role: string | null
+  aliases: string[]
+  api_ids: string[]
+  ctx: number | null
+  ttl: number | null
+  cmd: string
+  filename: string
+  quant: string
+  size_bytes: number | null
+  incomplete: boolean
+}
+
+export interface Health {
+  status: string
+  version: string
+  engine_reachable: boolean
+}