feat(admin): erweiterte Kennzahlen + Kunden-Detail-API

- /admin/stats: newAccounts30d, suspendedInstances, ARR, byPlan (count+revenue)
- /admin/accounts/🆔 Voll-Detail (Profil + Abo-Historie + Instanzen, Plan-Preis)

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

server/routes/admin.js

@@ -24,20 +24,34 @@ adminRouter.use(requireAdmin);
 // — Kennzahlen fürs Dashboard —
 adminRouter.get("/stats", async (_req, res) => {
   const accounts = await one("select count(*)::int n from accounts");
+  const newAccounts = await one("select count(*)::int n from accounts where created_at > now() - interval '30 days'");
   const activeSubs = await one("select count(*)::int n from subscriptions where status = 'active'");
   const instances = await one("select count(*)::int n from instances");
   const activeInst = await one("select count(*)::int n from instances where status = 'active'");
+  const suspendedInst = await one("select count(*)::int n from instances where status = 'suspended'");
 
-  // MRR (geschätzt): Summe der Plan-Preise aller aktiven Abos.
+  // MRR + Verteilung nach Plan (nur aktive Abos).
   const { rows: subs } = await query("select plan from subscriptions where status = 'active'");
-  const mrr = subs.reduce((sum, s) => sum + (getPlan(s.plan)?.priceChf || 0), 0);
+  let mrr = 0;
+  const byPlan = {};
+  for (const s of subs) {
+    const p = getPlan(s.plan);
+    mrr += p?.priceChf || 0;
+    byPlan[s.plan] = byPlan[s.plan] || { count: 0, revenue: 0, name: p?.name || s.plan };
+    byPlan[s.plan].count += 1;
+    byPlan[s.plan].revenue += p?.priceChf || 0;
+  }
 
   res.json({
     accounts: accounts.n,
+    newAccounts30d: newAccounts.n,
     activeSubscriptions: activeSubs.n,
     instances: instances.n,
     activeInstances: activeInst.n,
+    suspendedInstances: suspendedInst.n,
     mrrChf: mrr,
+    arrChf: mrr * 12,
+    byPlan, // { solo: {count,revenue,name}, ... }
   });
 });
 
@@ -61,7 +75,31 @@ adminRouter.get("/accounts", async (_req, res) => {
   res.json({ accounts: rows });
 });
 
-// — Instanzen eines Kontos —
+// — Voll-Detail eines Kontos: Profil + Abo-Historie + Instanzen —
+adminRouter.get("/accounts/:id", async (req, res) => {
+  const account = await one(
+    `select id, email, company, contact_name, street, zip, city, country, phone, created_at
+       from accounts where id = $1`,
+    [req.params.id]
+  );
+  if (!account) return res.status(404).json({ error: "Konto nicht gefunden." });
+
+  const { rows: subscriptions } = await query(
+    `select plan, status, current_period_end, stripe_subscription_id, created_at
+       from subscriptions where account_id = $1 order by created_at desc`,
+    [req.params.id]
+  );
+  const { rows: instances } = await query(
+    "select id, studio_slug, label, instance_url, status, created_at from instances where account_id = $1 order by created_at",
+    [req.params.id]
+  );
+  // Plan-Preis an die Abos hängen (fürs UI).
+  for (const s of subscriptions) s.priceChf = getPlan(s.plan)?.priceChf ?? null;
+
+  res.json({ account, subscriptions, instances });
+});
+
+// — Instanzen eines Kontos (Kurzform) —
 adminRouter.get("/accounts/:id/instances", async (req, res) => {
   const { rows } = await query(
     "select id, studio_slug, label, instance_url, status, created_at from instances where account_id = $1 order by created_at",