Enhance authentication setup and improve documentation

Adds automatic auth secret generation, improves environment file handling,
creates client env files, adds trusted origins configuration, enhances
README generation with better structure and instructions, and updates
post-installation guidance with clearer steps.

apps/cli/template/base/packages/client/src/components/user-menu.tsx

@@ -28,6 +28,33 @@ export default function UserMenu() {
     return <Skeleton className="h-9 w-24" />;
   }
 
+  if (!session) {
+    return (
+      <DropdownMenu>
+        <DropdownMenuTrigger asChild>
+          <Button variant="outline">Sign In</Button>
+        </DropdownMenuTrigger>
+        <DropdownMenuContent className="bg-card">
+          <DropdownMenuLabel>My Account</DropdownMenuLabel>
+          <DropdownMenuSeparator />
+          <DropdownMenuItem asChild>
+            <Button
+              variant="outline"
+              className="w-full"
+              onClick={() => {
+                navigate({
+                  to: "/sign-in",
+                });
+              }}
+            >
+              Sign In
+            </Button>
+          </DropdownMenuItem>
+        </DropdownMenuContent>
+      </DropdownMenu>
+    );
+  }
+
   return (
     <DropdownMenu>
       <DropdownMenuTrigger asChild>