feat(setup): add unresolved folders GUI for manual series resolution

- Add /setup/unresolved page for manual provider key resolution
- Integrate unresolved check into setup wizard flow
- Auto-redirect to unresolved page if folders need resolution

After initial setup scan, folders that couldn't be auto-resolved
are now tracked and can be resolved manually via the GUI.

Endpoints:
- GET /api/setup/unresolved - list unresolved folders
- POST /api/setup/unresolved/{folder}/resolve - resolve with provider key
- POST /api/setup/unresolved/{folder}/search - re-search for suggestions
- DELETE /api/setup/unresolved/{folder} - delete without adding

src/server/web/templates/setup.html

@@ -790,17 +790,36 @@
                 const data = await response.json();
 
                 if (response.ok && data.status === 'ok') {
-                    // Redirect to loading page if provided, otherwise go to login
+                    // Redirect to loading page if provided, otherwise check for unresolved folders
                     if (data.redirect) {
                         showMessage('Setup saved! Initializing your anime library...', 'success');
                         setTimeout(() => {
                             window.location.href = data.redirect;
                         }, 500);
                     } else {
-                        showMessage('Setup completed successfully! Redirecting to login...', 'success');
-                        setTimeout(() => {
-                            window.location.href = '/login';
-                        }, 2000);
+                        // Check for unresolved folders before redirecting
+                        showMessage('Setup completed successfully! Checking for unresolved series...', 'success');
+                        setTimeout(async () => {
+                            try {
+                                const token = localStorage.getItem('auth_token');
+                                const res = await fetch('/api/setup/unresolved', {
+                                    headers: { 'Authorization': `Bearer ${token}` }
+                                });
+                                if (res.ok) {
+                                    const unresolved = await res.json();
+                                    if (unresolved && unresolved.length > 0) {
+                                        window.location.href = '/setup/unresolved';
+                                    } else {
+                                        window.location.href = '/login';
+                                    }
+                                } else {
+                                    window.location.href = '/login';
+                                }
+                            } catch (e) {
+                                console.error('Error checking unresolved folders:', e);
+                                window.location.href = '/login';
+                            }
+                        }, 1000);
                     }
                 } else {
                     const errorMessage = data.detail || data.message || 'Setup failed';