Workstream 1: Projekt-Fundament & Design-System (Phase 0)

Greenfield-Next.js-15-App-Router-Gerüst (TS strict) mit:
- Route-Groups (auth)/(app) inkl. loading/error/not-found je Group;
  Guard-Slot-Kommentar im (app)/layout.tsx (vom Auth-WS zu füllen).
- "Amtlich"/Netzknoten-Designsystem: Tailwind-Tokens (Navy #1B3A5B,
  Signalrot #E2231A, Anthrazit, Nebelgrau, bereit/Wartung), tabular-nums,
  Serif-Display/Inter-Sans via CSS-Variablen, Inline-SVG-Logo.
- Radix-Basiskomponenten (button/input/label/badge/tabs/dialog/select/
  switch/slider); StatusBadge entspricht asset_status.
- Kanonisches src/lib/env.ts (Zod, Fail-Fast) mit ALLEN DB-/Auth-/Geo-Slots
  inkl. AUTH_URL; isHttps-Ableitung. Zentrale i18n-Tabelle de.ts + t().
- Drizzle-Setup: client.ts (Pool-Singleton), leeres schema/index.ts-Barrel
  (KEIN Migrations-Eigentümer), drizzle.config.ts, .env.example.
- next.config.ts: output:standalone, experimental.authInterrupts,
  Security-Header. Vitest + Fail-Fast-Env-Test (TDD, 5/5 grün).

Bewusst KEINE Auth-Logik und KEINE fachlichen Tabellen.

Verifikation: typecheck/lint/test grün; npm run build erzeugt
.next/standalone/server.js; curl /anmelden -> lang="de" + FlorianNetz.
next/font/google durch CSS-Variablen ersetzt (air-gapped-Build).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tailwind.config.ts

@@ -0,0 +1,33 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  content: ["./src/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        navy: "#1B3A5B",
+        signal: "#E2231A",
+        anthrazit: "#1A2530",
+        nebel: "#F6F8FA",
+        bereit: "#1F8F5A",
+        wartung: "#B5460F",
+        rand: "#D9DEE5",
+      },
+      fontFamily: {
+        sans: ["var(--font-sans)", "Inter", "system-ui", "sans-serif"],
+        display: ["var(--font-display)", "Source Serif 4", "Georgia", "serif"],
+      },
+      fontFeatureSettings: {
+        tnum: '"tnum" 1',
+      },
+      borderRadius: {
+        sm: "2px",
+        DEFAULT: "4px",
+        md: "6px",
+      },
+    },
+  },
+  plugins: [],
+};
+
+export default config;