Neon / portal template support (#713)

TODOs:
- [x] Do restart when checkout / restore if there is a DB
- [x] List all branches (branch id, name, date)
- [x] Allow checking out versions with no DB
- [x] safeguard to never delete main branches
- [x] create app hook for neon template
- [x] weird UX with connector on configure panel
- [x] tiny neon logo in connector
- [x] deploy to vercel
- [x] build forgot password page
- [x] what about email setup
- [x] lots of imgix errors
- [x] edit file - db snapshot
- [x] DYAD_DISABLE_DB_PUSH
- [ ] update portal doc
- [x] switch preview branch to be read-only endpoint
- [x] disable supabase sys prompt if neon is enabled
- [ ] https://payloadcms.com/docs/upload/storage-adapters
- [x] need to use main branch...

Phase 2?
- [x] generate DB migrations

src/components/NeonIntegration.tsx

@@ -0,0 +1,29 @@
+import { useSettings } from "@/hooks/useSettings";
+import { NeonDisconnectButton } from "@/components/NeonDisconnectButton";
+
+export function NeonIntegration() {
+  const { settings } = useSettings();
+
+  const isConnected = !!settings?.neon?.accessToken;
+
+  if (!isConnected) {
+    return null;
+  }
+
+  return (
+    <div className="flex items-center justify-between">
+      <div>
+        <h3 className="text-sm font-medium text-gray-700 dark:text-gray-300">
+          Neon Integration
+        </h3>
+        <p className="text-xs text-gray-500 dark:text-gray-400 mt-1">
+          Your account is connected to Neon.
+        </p>
+      </div>
+
+      <div className="flex items-center gap-2">
+        <NeonDisconnectButton />
+      </div>
+    </div>
+  );
+}