style: fix all flake8 linter errors across app/ directory

- Run Black formatter and isort on all app/ files
- Remove unused imports (F401) across multiple files
- Add # noqa: F401 for intentional re-exports in celery_worker.py,
  tasks/__init__.py, utils.py, frontend.py, views/base.py
- Fix f-strings without placeholders (F541) in azure.py, notification.py,
  check_credentials.py, upload_to_onedrive.py, settings.py
- Fix bare except (E722) in upload_to_sftp.py
- Fix block comment format (E265) in models.py
- Move imports to top of file to fix E402 in celery_app.py, celery_worker.py
- Fix line-too-long (E501) by wrapping strings in multiple files
- Remove unused variable (F841) in upload_to_nextcloud.py

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

app/tasks/finalize_document_storage.py

@@ -2,21 +2,22 @@
 
 import logging
 import os
-from app.config import settings
-from app.tasks.retry_config import BaseTaskWithRetry
+
 # Import the shared Celery instance
 from app.celery_app import celery
+from app.config import settings
+from app.database import SessionLocal
+from app.models import FileRecord
+from app.tasks.retry_config import BaseTaskWithRetry
 
 # Import the aggregator task and validator
-from app.tasks.send_to_all import send_to_all_destinations, get_configured_services_from_validator
-
-# Import notification utility
-from app.utils.notification import notify_file_processed
+from app.tasks.send_to_all import get_configured_services_from_validator, send_to_all_destinations
 
 # Import database and logging utils from main
 from app.utils import log_task_progress
-from app.database import SessionLocal
-from app.models import FileRecord
+
+# Import notification utility
+from app.utils.notification import notify_file_processed
 
 logger = logging.getLogger(__name__)
 
@@ -30,18 +31,22 @@ def finalize_document_storage(self, original_file: str, processed_file: str, met
     """
     task_id = self.request.id
     logger.info(f"[{task_id}] Finalizing document storage for {processed_file}")
-    
+
     # 1. Update Database Status (From Main)
-    log_task_progress(task_id, "finalize_document_storage", "in_progress", f"Finalizing: {os.path.basename(processed_file)}", file_id=file_id)
-    
+    log_task_progress(
+        task_id,
+        "finalize_document_storage",
+        "in_progress",
+        f"Finalizing: {os.path.basename(processed_file)}",
+        file_id=file_id,
+    )
+
     # Get file_id from database if not provided (fallback logic from Main)
     if file_id is None:
         with SessionLocal() as db:
             # Only as a last resort, try to find by exact match on local_filename
             tmp_path = os.path.join(settings.workdir, "tmp", os.path.basename(original_file))
-            file_record = db.query(FileRecord).filter(
-                FileRecord.local_filename == tmp_path
-            ).first()
+            file_record = db.query(FileRecord).filter(FileRecord.local_filename == tmp_path).first()
             if file_record:
                 file_id = file_record.id
 
@@ -54,7 +59,7 @@ def finalize_document_storage(self, original_file: str, processed_file: str, met
         for service_name, is_configured in configured_services.items():
             if is_configured:
                 # Format service names for display
-                display_name = service_name.replace('_', ' ').title()
+                display_name = service_name.replace("_", " ").title()
                 configured_destinations.append(display_name)
     except Exception as e:
         logger.warning(f"[WARNING] Could not determine configured destinations: {e}")
@@ -63,8 +68,10 @@ def finalize_document_storage(self, original_file: str, processed_file: str, met
     # 3. Queue Uploads (Merged)
     # Uses Main branch signature to ensure file_id is passed, but keeps logic structure
     logger.info(f"[{task_id}] Queueing uploads to all destinations")
-    log_task_progress(task_id, "finalize_document_storage", "success", "Queuing uploads to destinations", file_id=file_id)
-    
+    log_task_progress(
+        task_id, "finalize_document_storage", "success", "Queuing uploads to destinations", file_id=file_id
+    )
+
     # Note: send_to_all_destinations is asynchronous and queues upload tasks
     # We pass 'True' (delete_after) and 'file_id' as per Main branch requirements
     send_to_all_destinations.delay(processed_file, True, file_id)
@@ -76,17 +83,11 @@ def finalize_document_storage(self, original_file: str, processed_file: str, met
         # Get file information
         file_size = os.path.getsize(processed_file) if os.path.exists(processed_file) else 0
         filename = os.path.basename(processed_file)
-        
+
         notify_file_processed(
-            filename=filename,
-            file_size=file_size,
-            metadata=metadata,
-            destinations=configured_destinations
+            filename=filename, file_size=file_size, metadata=metadata, destinations=configured_destinations
         )
     except Exception as e:
         logger.warning(f"[WARNING] Failed to send file processed notification: {e}")
 
-    return {
-        "status": "Completed",
-        "file": processed_file
-    }
+    return {"status": "Completed", "file": processed_file}