Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting in various files including http.py, language.py, logger.py, safe_exec.py, and SQL migration scripts.
- Consolidated import statements and removed unnecessary blank lines.
- Updated logging configuration for better clarity.
- Enhanced the safe execution code with improved error handling and logging.
- Removed commented-out code and unnecessary variables in backfill_zero_trades.py and other scripts.
- Added a pyproject.toml for Ruff and Vulture configuration.
- Introduced requirements-dev.txt for development dependencies.
- Removed commented-out stock entries in init.sql for cleaner migration scripts.

.github/workflows/basic-ci.yml

@@ -17,7 +17,7 @@ jobs:
   python-check:
     name: Python Syntax Check
     runs-on: ubuntu-latest
-    
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -59,12 +59,12 @@ jobs:
           python -c "
           import sys
           sys.path.insert(0, '.')
-          
+
           # Import key modules to verify they are loadable
           from app import create_app
           from app.config import settings
           from app.routes import health
-          
+
           print('✓ Core modules imported successfully')
           print('✓ No critical import errors detected')
           "
@@ -77,7 +77,7 @@ jobs:
   frontend-check:
     name: Frontend Build Check
     runs-on: ubuntu-latest
-    
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4