fix(admin): persist data directory and pass env vars

components/admin/AdminLoginForm.tsx

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+"use client";
+
+import Image from "next/image";
+import { useRouter } from "next/navigation";
+import { useState, type FormEvent } from "react";
+
+export default function AdminLoginForm({ nextPath = "/admin" }: { nextPath?: string }) {
+  const router = useRouter();
+  const [error, setError] = useState("");
+  const [pending, setPending] = useState(false);
+
+  async function submit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setError("");
+    setPending(true);
+    try {
+      const response = await fetch("/api/admin/login", {
+        method: "POST",
+        body: new FormData(event.currentTarget),
+      });
+      const result = await response.json() as { message?: string };
+      if (!response.ok) throw new Error(result.message ?? "Anmeldung fehlgeschlagen.");
+      router.push(nextPath);
+      router.refresh();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Anmeldung fehlgeschlagen.");
+    } finally {
+      setPending(false);
+    }
+  }
+
+  return (
+    <main className="admin-login-page">
+      <form className="admin-login-card" onSubmit={submit}>
+        <Image src="/funktechnik_schubert_logo.jpg" alt="Funktechnik Schubert" width={1672} height={941} priority />
+        <h1>Administration Login</h1>
+        <label>
+          E-Mail
+          <input name="email" type="email" autoComplete="username" required />
+        </label>
+        <label>
+          Passwort
+          <input name="password" type="password" autoComplete="current-password" required />
+        </label>
+        {error && <p className="error">{error}</p>}
+        <button className="button" type="submit" disabled={pending}>{pending ? "Anmeldung..." : "Anmelden"}</button>
+      </form>
+    </main>
+  );
+}

components/admin/AdminShell.tsx

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+"use client";
+
+import Image from "next/image";
+import Link from "next/link";
+import { usePathname, useRouter } from "next/navigation";
+import type { ReactNode } from "react";
+
+const navItems = [
+  ["Dashboard", "/admin"],
+  ["Kontaktanfragen", "/admin/kontaktanfragen"],
+  ["Reparaturanfragen", "/admin/reparaturanfragen"],
+  ["Website-Inhalte", "/admin/website"],
+  ["Medien", "/admin/medien"],
+  ["Einstellungen", "/admin/einstellungen"],
+  ["SMTP", "/admin/smtp"],
+  ["SEO", "/admin/seo"],
+  ["System", "/admin/system"],
+] as const;
+
+export default function AdminShell({ children }: { children: ReactNode }) {
+  const pathname = usePathname();
+  const router = useRouter();
+
+  async function logout() {
+    await fetch("/api/admin/logout", { method: "POST" });
+    router.push("/admin/login");
+    router.refresh();
+  }
+
+  return (
+    <div className="admin-shell">
+      <aside className="admin-sidebar">
+        <Link className="admin-logo" href="/admin">
+          <Image src="/funktechnik_schubert_logo.jpg" alt="Funktechnik Schubert" width={1672} height={941} />
+        </Link>
+        <nav className="admin-nav" aria-label="Administration">
+          {navItems.map(([label, href]) => (
+            <Link key={href} href={href} aria-current={pathname === href ? "page" : undefined}>
+              {label}
+            </Link>
+          ))}
+        </nav>
+        <button className="admin-logout" type="button" onClick={logout}>Abmelden</button>
+      </aside>
+      <div className="admin-main">{children}</div>
+    </div>
+  );
+}

components/admin/StatusSelect.tsx

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+"use client";
+
+import { useRouter } from "next/navigation";
+import { useState } from "react";
+import type { InquiryStatus } from "@/lib/admin/types";
+
+type Props = {
+  id: string;
+  type: "contact" | "repair";
+  status: InquiryStatus;
+};
+
+export default function StatusSelect({ id, type, status }: Props) {
+  const router = useRouter();
+  const [value, setValue] = useState(status);
+
+  async function update(nextStatus: InquiryStatus) {
+    setValue(nextStatus);
+    const response = await fetch(`/api/admin/${type}/${id}`, {
+      method: "PATCH",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ status: nextStatus }),
+    });
+    if (response.ok) router.refresh();
+  }
+
+  return (
+    <select className="status-select" value={value} onChange={(event) => update(event.target.value as InquiryStatus)}>
+      <option value="new">Neu</option>
+      <option value="in_progress">In Prüfung</option>
+      <option value="done">Erledigt</option>
+    </select>
+  );
+}