feat: complete commercial control plane, billing, auth, and model catalog

- add PostgreSQL control-plane persistence with Redis-degraded hot reload
- implement prepaid balance, usage ledger, Stripe top-up and reconciliation
- add registration, email verification, password reset, invitations and RBAC
- support TOTP, Passkey MFA, device sessions, quotas and rate limits
- add tenant billing profiles, audit logs and operational readiness checks
- build authenticated admin console, Quickstart, Playground and usage analytics
- add public model catalog with pricing, filtering and cost estimation
- support OpenAI Responses providers and provider health failover
- validate real upstream usage reporting and balance settlement

1 files changed, 10 insertions, 1 deletions

diff --git a/internal/adminui/ui.go b/internal/adminui/ui.go
index 7f58030..49899ea 100644
--- a/internal/adminui/ui.go
+++ b/internal/adminui/ui.go
@@ -14,5 +14,14 @@ func Handler() http.Handler {
 	if err != nil {
 		panic(err)
 	}
-	return http.FileServer(http.FS(content))
+	files := http.FileServer(http.FS(content))
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /models", func(w http.ResponseWriter, r *http.Request) {
+		http.ServeFileFS(w, r, content, "models.html")
+	})
+	mux.HandleFunc("GET /models/", func(w http.ResponseWriter, r *http.Request) {
+		http.Redirect(w, r, "../models", http.StatusPermanentRedirect)
+	})
+	mux.Handle("/", files)
+	return mux
 }