style: apply black and isort formatting across entire codebase

- Standardize quote style (single to double quotes)
- Reorder and group imports alphabetically
- Fix line breaks and indentation for consistency
- Apply PEP 8 formatting standards

Also updated Makefile to exclude both venv and .venv from code quality checks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/api/v1/vendor/dashboard.py

@@ -4,13 +4,14 @@ Vendor dashboard and statistics endpoints.
 """
 
 import logging
+
 from fastapi import APIRouter, Depends, Request
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_vendor_api
 from app.core.database import get_db
-from middleware.vendor_context import require_vendor_context
 from app.services.stats_service import stats_service
+from middleware.vendor_context import require_vendor_context
 from models.database.user import User
 from models.database.vendor import Vendor
 
@@ -20,9 +21,9 @@ logger = logging.getLogger(__name__)
 
 @router.get("/stats")
 def get_vendor_dashboard_stats(
-        request: Request,
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    request: Request,
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Get vendor-specific dashboard statistics.
@@ -38,24 +39,23 @@ def get_vendor_dashboard_stats(
     """
     # Get vendor from authenticated user's vendor_user record
     from models.database.vendor import VendorUser
-    vendor_user = db.query(VendorUser).filter(
-        VendorUser.user_id == current_user.id
-    ).first()
+
+    vendor_user = (
+        db.query(VendorUser).filter(VendorUser.user_id == current_user.id).first()
+    )
 
     if not vendor_user:
         from fastapi import HTTPException
+
         raise HTTPException(
-            status_code=403,
-            detail="User is not associated with any vendor"
+            status_code=403, detail="User is not associated with any vendor"
         )
 
     vendor = vendor_user.vendor
     if not vendor or not vendor.is_active:
         from fastapi import HTTPException
-        raise HTTPException(
-            status_code=404,
-            detail="Vendor not found or inactive"
-        )
+
+        raise HTTPException(status_code=404, detail="Vendor not found or inactive")
 
     # Get vendor-scoped statistics
     stats_data = stats_service.get_vendor_stats(db=db, vendor_id=vendor.id)
@@ -82,5 +82,5 @@ def get_vendor_dashboard_stats(
         "revenue": {
             "total": stats_data.get("total_revenue", 0),
             "this_month": stats_data.get("revenue_this_month", 0),
-        }
+        },
     }