Refactor security scanning and database setup

- Update security scan workflow to utilize a dedicated script for checking secrets, improving detection accuracy.
- Modify database connection setup in multiple scripts to use an environment variable fallback for DATABASE_URL, enhancing flexibility in different environments.

scripts/dev-simple.js

@@ -12,7 +12,7 @@ console.log('💡 For full development environment with DB, use: npm run dev:ful
 const env = {
   ...process.env,
   NODE_ENV: 'development',
-  DATABASE_URL: 'postgresql://portfolio_user:portfolio_dev_pass@localhost:5432/portfolio_dev?schema=public',
+  DATABASE_URL: process.env.DATABASE_URL || 'postgresql://portfolio_user:portfolio_dev_pass@localhost:5432/portfolio_dev?schema=public',
   REDIS_URL: 'redis://localhost:6379',
   NEXT_PUBLIC_BASE_URL: 'http://localhost:3000'
 };