fix: middleware.ts → proxy.ts (Next.js 16 Konvention)

Next.js 16 erwartet proxy.ts mit export function proxy(),
nicht middleware.ts. Deprecation-Warnung damit beseitigt.
CLAUDE.md mit korrekter Konvention aktualisiert.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -16,7 +16,7 @@ No test suite exists. Deploy via `./deploy.sh [tag]` — builds multiplatform Do
 
 Next.js 16 App Router application. All pages are server components; interactive parts are Client Components in `app/MainClient.tsx` and `components/`.
 
-**Auth flow**: Users come from the existing MySQL `beos` table (not a separate users table). Login via `app/login/actions.ts` → `lib/auth.ts` (bcryptjs). Sessions are JWT cookies via jose (`lib/session.ts`, 1-hour expiry). If `pw IS NULL`, the default password is `welzheim` and `mustChangePassword` is forced to `true`. The middleware file exports `proxy` (not `middleware`) — Next.js 16 requirement.
+**Auth flow**: Users come from the existing MySQL `beos` table (not a separate users table). Login via `app/login/actions.ts` → `lib/auth.ts` (bcryptjs). Sessions are JWT cookies via jose (`lib/session.ts`, 1-hour expiry). If `pw IS NULL`, the default password is `welzheim` and `mustChangePassword` is forced to `true`. Middleware lives in `proxy.ts` (Next.js 16 convention) and exports `middleware` (not `proxy`).
 
 **Database**: MySQL, database name `sternwarte`, via `lib/db.ts` connection pool. The pre-existing `beos` table has non-standard columns: `` `kürzel` `` (umlaut → always needs backticks), `pw`, `id` (all lowercase). The DB charset is **utf8mb4** (collation `utf8mb4_unicode_ci`); connection pool uses `charset: 'utf8mb4'`.
 

proxy.ts

@@ -7,7 +7,7 @@ const secretKey = process.env.AUTH_SECRET;
 if (!secretKey) throw new Error('AUTH_SECRET Umgebungsvariable ist nicht gesetzt!');
 const key = new TextEncoder().encode(secretKey);
 
-export async function middleware(request: NextRequest) {
+export async function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
 
   if (pathname.startsWith('/login') || pathname.startsWith('/_next') || pathname.startsWith('/favicon')) {