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

docs/DeploymentGuide.md

@@ -349,16 +349,18 @@ workdir:
 
 ## Scaling
 
+DocuElevate is designed for horizontal scaling.  Both API and worker pods are stateless and can be scaled independently.
+
 ### Docker Compose
 
-Add more worker containers:
+Scale workers (task processing) and API pods (request handling) independently:
 
-```yaml
-worker:
-  deploy:
-    replicas: 3
+```bash
+docker compose up -d --scale worker=3 --scale api=2
 ```
 
+> **Note:** The `beat` service (Celery Beat scheduler) must always run as exactly **one** instance.  Do not scale it.  It publishes periodic tasks to the Redis broker; workers pick them up.
+
 ### Kubernetes / Helm
 
 Enable HPA:
@@ -377,13 +379,15 @@ worker:
     maxReplicas: 10
 ```
 
+The Helm chart deploys a separate **beat** pod (always 1 replica, `Recreate` strategy) so that scheduled tasks are never duplicated when workers scale.
+
 ---
 
 ## Monitoring
 
 - **Docker Compose**: `docker-compose logs -f`, `docker stats`
 - **Kubernetes**: `kubectl logs -l app.kubernetes.io/component=api -f`
-- **Prometheus / Grafana**: Scrape the `/api/health` endpoint for readiness; add custom metrics as needed.
+- **Prometheus / Grafana**: Scrape the `/api/diagnostic/healthz/ready` endpoint for readiness; add custom metrics as needed.
 - **Uptime Kuma**: Set `UPTIME_KUMA_URL` to your push URL for heartbeat monitoring.
 
 ---