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/create_default_content_pages.py

@@ -26,20 +26,19 @@ Usage:
 """
 
 import sys
-from pathlib import Path
 from datetime import datetime, timezone
+from pathlib import Path
 
 # Add project root to path
 project_root = Path(__file__).parent.parent
 sys.path.insert(0, str(project_root))
 
-from sqlalchemy.orm import Session
 from sqlalchemy import select
+from sqlalchemy.orm import Session
 
 from app.core.database import SessionLocal
 from models.database.content_page import ContentPage
 
-
 # ============================================================================
 # DEFAULT PAGE CONTENT
 # ============================================================================
@@ -458,6 +457,7 @@ DEFAULT_PAGES = [
 # SCRIPT FUNCTIONS
 # ============================================================================
 
+
 def create_default_pages(db: Session) -> None:
     """
     Create default platform content pages.
@@ -475,13 +475,14 @@ def create_default_pages(db: Session) -> None:
         # Check if page already exists (platform default with this slug)
         existing = db.execute(
             select(ContentPage).where(
-                ContentPage.vendor_id == None,
-                ContentPage.slug == page_data["slug"]
+                ContentPage.vendor_id == None, ContentPage.slug == page_data["slug"]
             )
         ).scalar_one_or_none()
 
         if existing:
-            print(f"  ⏭️  Skipped: {page_data['title']} (/{page_data['slug']}) - already exists")
+            print(
+                f"  ⏭️  Skipped: {page_data['title']} (/{page_data['slug']}) - already exists"
+            )
             skipped_count += 1
             continue
 
@@ -519,7 +520,9 @@ def create_default_pages(db: Session) -> None:
     if created_count > 0:
         print("✅ Default platform content pages created successfully!\n")
         print("Next steps:")
-        print("  1. View pages at: /about, /contact, /faq, /shipping, /returns, /privacy, /terms")
+        print(
+            "  1. View pages at: /about, /contact, /faq, /shipping, /returns, /privacy, /terms"
+        )
         print("  2. Vendors can override these pages through the vendor dashboard")
         print("  3. Edit platform defaults through the admin panel\n")
     else:
@@ -530,6 +533,7 @@ def create_default_pages(db: Session) -> None:
 # MAIN EXECUTION
 # ============================================================================
 
+
 def main():
     """Main execution function."""
     print("\n🚀 Starting Default Content Pages Creation Script...\n")