feat(auth): make OAuth credentials user-specific via UserIntegration records

Setup pages now accept an integration_id query param to save OAuth
credentials to the user's personal UserIntegration record instead
of global settings. The integrations dashboard shows an "Authorize"
button for OAuth types (Dropbox, Google Drive, OneDrive) that need
credentials.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_views_integrations.py

@@ -76,6 +76,33 @@ class TestIntegrationsDashboardView:
         assert "return '/google-drive'" not in body.replace("/google-drive-setup", "")
         assert "return '/onedrive'" not in body.replace("/onedrive-setup", "")
 
+    def test_integrations_page_contains_authorize_button(self, client):
+        """GET /integrations page includes per-user Authorize button for OAuth types."""
+        response = client.get("/integrations")
+        assert response.status_code == 200
+        body = response.text
+        assert "isOAuthType" in body
+        assert "Authorize" in body
+        assert "integration_id=" in body
+
+    def test_integrations_page_contains_oauth_types_constant(self, client):
+        """GET /integrations includes OAUTH_TYPES Set constant."""
+        response = client.get("/integrations")
+        assert response.status_code == 200
+        body = response.text
+        assert "OAUTH_TYPES" in body
+        assert "'DROPBOX'" in body
+        assert "'GOOGLE_DRIVE'" in body
+        assert "'ONEDRIVE'" in body
+
+    def test_integrations_page_modal_info_box_per_user(self, client):
+        """The create modal info box instructs to save first then authorize."""
+        response = client.get("/integrations")
+        assert response.status_code == 200
+        body = response.text
+        assert "Save this integration first" in body
+        assert "personal integration record" in body
+
     def test_integrations_page_contains_quota_indicators(self, client):
         """GET /integrations page includes quota labels."""
         response = client.get("/integrations")