fix: restore all code deleted/truncated by d2217531 Jules SSRF commit

Commit d2217531 (google-labs-jules SSRF fix) catastrophically deleted
11,500+ lines across 100+ files while fixing an unrelated IMAP issue.

Restored from d2217531^ (pre-bad-commit state):

Deleted files (fully restored):
- app/api/{automation,classification_rules,comments,sharing}.py
- app/middleware/upload_rate_limit.py
- app/tasks/{automation_tasks,classify_document}.py
- app/utils/{automation_hooks,classification_rules}.py
- docs/AppleAppStoreCompliance.md
- frontend/input.css, package.json, package-lock.json, tailwind.config.js
- frontend/static/js/{annotations,claim,comments,sharing}.js
- frontend/templates/{admin_connections,file_annotations,file_summary}.html
- tests/{test_api_files_comprehensive,test_auth_extended,test_sharing,
         test_comments,test_connections,test_imap_profiles,test_api_sessions,
         test_automation,test_classification_rules,test_api_advanced_filters,
         test_api_classification_rules,test_upload_rate_limit,test_api_dropbox,
         test_classify_document,test_comments_ui,test_upload_to_icloud,
         test_api_onedrive_comprehensive,test_frontend_build,test_sentry,
         test_diagnostic,test_database,test_views_dropbox,test_local_auth}.py

Truncated files (content restored):
- app/{auth,config,main,models,celery_worker,database}.py
- app/api/{__init__,api_tokens,diagnostic,dropbox,files,google_drive,
           integrations,local_auth,mobile,onedrive,pipelines,qr_auth,
           settings,url_upload}.py
- app/middleware/upload_rate_limit.py
- app/tasks/upload_to_nextcloud.py
- app/utils/{allowed_types,settings_service,settings_sync,user_scope,webhook}.py
- app/views/{base,dropbox,files,google_drive,onedrive,settings}.py
- docs/{API,AuthenticationSetup,ConfigurationGuide,DatabaseConfiguration,
        DeploymentGuide,DropboxSetup,GoogleDriveSetup,KubernetesDeployment,
        MobileApp,OneDriveSetup,ProductionReadiness,SentrySetup,
        SocialLoginSetup,UserGuide}.md
- frontend/static/{js/upload.js,styles.css}
- frontend/templates/{api_tokens,base,devices,dropbox,dropbox_callback,
                      file_view,files,google_drive,onedrive,onedrive_callback,
                      signup}.html
- frontend/translations/en.json
- migrations/env.py
- tests/{conftest,test_api_integrations,test_api_mobile,test_api_settings,
         test_api_tokens,test_audit_logs,test_duplicates,test_imap_tasks,
         test_setup_wizard,test_views_files_comprehensive}.py

Security fixes kept from post-d2217531 commits:
- app/utils/network.py: DNS SSRF fail-secure fix (06b0fced)
- app/utils/file_operations.py: path traversal fix (1018ea17)
- tests/test_imap_tasks.py: re-applied 4 is_private_ip mock patches

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/DocuElevate/sessions/51133dd8-9bec-41ab-aa10-3de753634187

tests/test_local_auth.py

@@ -322,6 +322,35 @@ def test_signup_duplicate_username(la_client, active_user):
     assert "Username" in resp.json()["detail"]
 
 
+@pytest.mark.integration
+def test_signup_invalid_username_with_dot(la_client):
+    """POST /api/auth/signup returns 422 with a list detail when username contains a dot.
+
+    This is a regression test for the bug where ``data.detail`` was an array,
+    causing the frontend to display ``[object Object]`` instead of a message.
+    """
+    with patch("app.api.local_auth.settings") as mock_settings:
+        mock_settings.allow_local_signup = True
+        mock_settings.multi_user_enabled = True
+        mock_settings.email_host = "smtp.example.com"
+        resp = la_client.post(
+            "/api/auth/signup",
+            json={
+                "email": "a@example.com",
+                "username": "christian.louis",
+                "password": "password1",
+                "password_confirm": "password1",
+            },
+        )
+    assert resp.status_code == 422
+    detail = resp.json()["detail"]
+    # FastAPI returns a list of validation errors for Pydantic constraint failures.
+    # Each entry must be a dict with a "msg" key so the frontend can extract a readable message.
+    assert isinstance(detail, list), "detail should be a list for Pydantic validation errors"
+    assert len(detail) > 0
+    assert "msg" in detail[0]
+
+
 @pytest.mark.integration
 def test_signup_smtp_failure_cleans_up(la_client, la_session):
     """POST /api/auth/signup cleans up user records if email send fails."""