Fixed the remaining Manager runtime coupling.

1. Root cause of the database error
The Manager proxy was bypassing installation checks, but / still resolved to src/app/page.tsx, which statically imported:
- @/auth
- Prisma
- business branding
- business permissions
- primary business data
The root route now redirects to /manager inside the proxy before the business homepage is evaluated.
2. Root cause of the Auth.js error
The global business SessionProvider was mounted around Manager pages. It automatically requested:

The business homepage is not evaluated first.
5. Provider and authentication separation
Manager mode:
- Uses ManagerProviders
- Uses the signed Manager cookie session
- Does not mount SessionProvider
- Does not call /api/auth/session
- Does not import business Auth.js or Prisma
Business mode:
- Dynamically loads the existing business Providers
- Continues using Auth.js and SessionProvider
- Preserves installation, /owner, and /staff behavior
6. Database independence
Manager mode now avoids database initialization for:
- Proxy requests
- Root metadata and viewport
- Root routing
- Manager pages
- Manager APIs
- Manifest requests
- Health requests
- Business Auth.js requests
- Business cron requests
No fake DATABASE_* variables were added.
7. Tests
Added coverage for:
- Manager / routing
- Manager /manager access
- No installation-state check in Manager mode
- Prisma import protection
- Business installation checks
- /owner protection
- Business Auth.js 404 boundary
- Manager health route without Prisma
- Manager manifest without business branding
8. Validation

src/app/manifest.ts

@@ -1,5 +1,4 @@
 import type { MetadataRoute } from "next";
-import { getBranding } from "@/lib/business/branding";
 
 /**
  * Next.js's manifest file convention — auto-served at /manifest.webmanifest
@@ -26,6 +25,21 @@ import { getBranding } from "@/lib/business/branding";
 export const dynamic = "force-dynamic";
 
 export default async function manifest(): Promise<MetadataRoute.Manifest> {
+  if (process.env.MANAGER_MODE === "true") {
+    return {
+      name: "NextChair Manager",
+      short_name: "Manager",
+      description: "Manage NextChair business deployments.",
+      start_url: "/manager",
+      scope: "/",
+      display: "standalone",
+      background_color: "#f4f6f4",
+      theme_color: "#111b15",
+      orientation: "portrait-primary",
+      icons: [{ src: "/icons/icon-192.png", sizes: "192x192", type: "image/png" }],
+    };
+  }
+  const { getBranding } = await import("@/lib/business/branding");
   const branding = await getBranding();
   return {
     name: branding.name,