feat: setup wizard page for first-deploy initialization

- SetupWizardPage: step-by-step config (DB, admin, project)
- Connects directly to AbstractWizard via SSH tunnel (127.0.0.1)
- App.tsx: detect backend health, show wizard if not ready
- Auto-switch wizard to readonly after setup
- Add VITE_WIZARD_PORT build arg
- Add vite-env.d.ts for type safety

src/vite-env.d.ts

@@ -0,0 +1,10 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_API_BASE: string
+  readonly VITE_WIZARD_PORT: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}