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>

scripts/test_vendor_management.py

@@ -9,10 +9,11 @@ Tests:
 - Transfer ownership
 """
 
-import requests
 import json
 from pprint import pprint
 
+import requests
+
 BASE_URL = "http://localhost:8000"
 ADMIN_TOKEN = None  # Will be set after login
 
@@ -25,8 +26,8 @@ def login_admin():
         f"{BASE_URL}/api/v1/admin/auth/login",  # ✅ Changed: added /admin/
         json={
             "username": "admin",  # Replace with your admin username
-            "password": "admin123"  # Replace with your admin password
-        }
+            "password": "admin123",  # Replace with your admin password
+        },
     )
 
     if response.status_code == 200:
@@ -44,7 +45,7 @@ def get_headers():
     """Get authorization headers."""
     return {
         "Authorization": f"Bearer {ADMIN_TOKEN}",
-        "Content-Type": "application/json"
+        "Content-Type": "application/json",
     }
 
 
@@ -60,13 +61,11 @@ def test_create_vendor_with_both_emails():
         "subdomain": "testdual",
         "owner_email": "owner@testdual.com",
         "contact_email": "contact@testdual.com",
-        "description": "Test vendor with separate emails"
+        "description": "Test vendor with separate emails",
     }
 
     response = requests.post(
-        f"{BASE_URL}/api/v1/admin/vendors",
-        headers=get_headers(),
-        json=vendor_data
+        f"{BASE_URL}/api/v1/admin/vendors", headers=get_headers(), json=vendor_data
     )
 
     if response.status_code == 200:
@@ -79,7 +78,7 @@ def test_create_vendor_with_both_emails():
         print(f"  Username: {data['owner_username']}")
         print(f"  Password: {data['temporary_password']}")
         print(f"\n🔗 Login URL: {data['login_url']}")
-        return data['id']
+        return data["id"]
     else:
         print(f"❌ Failed: {response.status_code}")
         print(response.text)
@@ -97,13 +96,11 @@ def test_create_vendor_single_email():
         "name": "Test Single Email Vendor",
         "subdomain": "testsingle",
         "owner_email": "owner@testsingle.com",
-        "description": "Test vendor with single email"
+        "description": "Test vendor with single email",
     }
 
     response = requests.post(
-        f"{BASE_URL}/api/v1/admin/vendors",
-        headers=get_headers(),
-        json=vendor_data
+        f"{BASE_URL}/api/v1/admin/vendors", headers=get_headers(), json=vendor_data
     )
 
     if response.status_code == 200:
@@ -113,12 +110,12 @@ def test_create_vendor_single_email():
         print(f"  Owner Email:   {data['owner_email']}")
         print(f"  Contact Email: {data['contact_email']}")
 
-        if data['owner_email'] == data['contact_email']:
+        if data["owner_email"] == data["contact_email"]:
             print("✅ Contact email correctly defaulted to owner email")
         else:
             print("❌ Contact email should have defaulted to owner email")
 
-        return data['id']
+        return data["id"]
     else:
         print(f"❌ Failed: {response.status_code}")
         print(response.text)
@@ -133,13 +130,13 @@ def test_update_vendor_contact_email(vendor_id):
 
     update_data = {
         "contact_email": "newcontact@business.com",
-        "name": "Updated Vendor Name"
+        "name": "Updated Vendor Name",
     }
 
     response = requests.put(
         f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}",
         headers=get_headers(),
-        json=update_data
+        json=update_data,
     )
 
     if response.status_code == 200:
@@ -163,8 +160,7 @@ def test_get_vendor_details(vendor_id):
     print("=" * 60)
 
     response = requests.get(
-        f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}",
-        headers=get_headers()
+        f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}", headers=get_headers()
     )
 
     if response.status_code == 200:
@@ -196,8 +192,7 @@ def test_transfer_ownership(vendor_id, new_owner_user_id):
 
     # First, get current owner info
     response = requests.get(
-        f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}",
-        headers=get_headers()
+        f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}", headers=get_headers()
     )
 
     if response.status_code == 200:
@@ -211,13 +206,13 @@ def test_transfer_ownership(vendor_id, new_owner_user_id):
     transfer_data = {
         "new_owner_user_id": new_owner_user_id,
         "confirm_transfer": True,
-        "transfer_reason": "Testing ownership transfer feature"
+        "transfer_reason": "Testing ownership transfer feature",
     }
 
     response = requests.post(
         f"{BASE_URL}/api/v1/admin/vendors/{vendor_id}/transfer-ownership",
         headers=get_headers(),
-        json=transfer_data
+        json=transfer_data,
     )
 
     if response.status_code == 200: