Fix code formatting and linting issues

- Auto-format all Python files with black and isort
- Remove unused imports with autoflake
- Fix flake8 issues (missing newlines, blank lines, etc.)
- Fix nonlocal/global scope issues in main.py
- Fix security.py import order (E402)
- Remove f-string without placeholders
- Add nosec comment for intentional exception handling
- Fix test imports to match refactored DMARCParser API

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

backend/app/api/api_v1/endpoints/setup.py

@@ -1,6 +1,6 @@
+
 from fastapi import APIRouter, HTTPException, status
 from pydantic import BaseModel, EmailStr
-from typing import Dict, Optional
 
 router = APIRouter()
 
@@ -11,30 +11,37 @@ setup_status = {
     "app_name": "DMARQ",
 }
 
+
 class SetupStatusResponse(BaseModel):
     """Setup status response"""
+
     is_setup_complete: bool
     app_name: str
 
+
 class AdminSetupRequest(BaseModel):
     """Admin user setup request body"""
+
     email: EmailStr
     username: str
     password: str
 
+
 class SystemConfigRequest(BaseModel):
     """System configuration setup request body"""
+
     app_name: str
     base_url: str
 
+
 @router.get("/status", response_model=SetupStatusResponse)
 async def get_setup_status():
     """Get the current setup status"""
     return SetupStatusResponse(
-        is_setup_complete=setup_status["is_setup_complete"],
-        app_name=setup_status["app_name"]
+        is_setup_complete=setup_status["is_setup_complete"], app_name=setup_status["app_name"]
     )
 
+
 @router.post("/admin", status_code=201)
 async def setup_admin(request: AdminSetupRequest):
     """
@@ -43,15 +50,15 @@ async def setup_admin(request: AdminSetupRequest):
     """
     if setup_status["is_setup_complete"]:
         raise HTTPException(
-            status_code=status.HTTP_400_BAD_REQUEST,
-            detail="Setup already completed"
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Setup already completed"
         )
-    
+
     # Store admin email
     setup_status["admin_email"] = request.email
-    
+
     return {"message": "Admin user setup completed"}
 
+
 @router.post("/system", status_code=200)
 async def setup_system(request: SystemConfigRequest):
     """
@@ -61,5 +68,5 @@ async def setup_system(request: SystemConfigRequest):
     # Store app name
     setup_status["app_name"] = request.app_name
     setup_status["is_setup_complete"] = True
-    
-    return {"message": "System settings saved successfully"}
+
+    return {"message": "System settings saved successfully"}