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/customers.py

@@ -6,6 +6,7 @@ Vendor customer management endpoints.
 
 import logging
 from typing import Optional
+
 from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
 
@@ -21,13 +22,13 @@ logger = logging.getLogger(__name__)
 
 @router.get("")
 def get_vendor_customers(
-        skip: int = Query(0, ge=0),
-        limit: int = Query(100, ge=1, le=1000),
-        search: Optional[str] = Query(None),
-        is_active: Optional[bool] = Query(None),
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=1000),
+    search: Optional[str] = Query(None),
+    is_active: Optional[bool] = Query(None),
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Get all customers for this vendor.
@@ -43,16 +44,16 @@ def get_vendor_customers(
         "total": 0,
         "skip": skip,
         "limit": limit,
-        "message": "Customer management coming in Slice 4"
+        "message": "Customer management coming in Slice 4",
     }
 
 
 @router.get("/{customer_id}")
 def get_customer_details(
-        customer_id: int,
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    customer_id: int,
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Get detailed customer information.
@@ -63,17 +64,15 @@ def get_customer_details(
     - Include order history
     - Include total spent, etc.
     """
-    return {
-        "message": "Customer details coming in Slice 4"
-    }
+    return {"message": "Customer details coming in Slice 4"}
 
 
 @router.get("/{customer_id}/orders")
 def get_customer_orders(
-        customer_id: int,
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    customer_id: int,
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Get order history for a specific customer.
@@ -83,19 +82,16 @@ def get_customer_orders(
     - Filter by vendor_id
     - Return order details
     """
-    return {
-        "orders": [],
-        "message": "Customer orders coming in Slice 5"
-    }
+    return {"orders": [], "message": "Customer orders coming in Slice 5"}
 
 
 @router.put("/{customer_id}")
 def update_customer(
-        customer_id: int,
-        customer_data: dict,
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    customer_id: int,
+    customer_data: dict,
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Update customer information.
@@ -105,17 +101,15 @@ def update_customer(
     - Verify customer belongs to vendor
     - Update customer preferences
     """
-    return {
-        "message": "Customer update coming in Slice 4"
-    }
+    return {"message": "Customer update coming in Slice 4"}
 
 
 @router.put("/{customer_id}/status")
 def toggle_customer_status(
-        customer_id: int,
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    customer_id: int,
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Activate/deactivate customer account.
@@ -125,17 +119,15 @@ def toggle_customer_status(
     - Verify customer belongs to vendor
     - Log the change
     """
-    return {
-        "message": "Customer status toggle coming in Slice 4"
-    }
+    return {"message": "Customer status toggle coming in Slice 4"}
 
 
 @router.get("/{customer_id}/stats")
 def get_customer_statistics(
-        customer_id: int,
-        vendor: Vendor = Depends(require_vendor_context()),
-        current_user: User = Depends(get_current_vendor_api),
-        db: Session = Depends(get_db),
+    customer_id: int,
+    vendor: Vendor = Depends(require_vendor_context()),
+    current_user: User = Depends(get_current_vendor_api),
+    db: Session = Depends(get_db),
 ):
     """
     Get customer statistics and metrics.
@@ -151,6 +143,5 @@ def get_customer_statistics(
         "total_spent": 0.0,
         "average_order_value": 0.0,
         "last_order_date": None,
-        "message": "Customer statistics coming in Slice 4"
+        "message": "Customer statistics coming in Slice 4",
     }
-