chore: Remove .env.production file and update documentation for environment file security

docs/development/APPLICATION_SECURITY.md

@@ -45,10 +45,17 @@
 
 #### **Environment Variables**
 
-- Never commit `.env` files to version control
-- Use separate environment files for different deployments
-- Rotate credentials regularly
-- Use strong, unique passwords for each environment
+- Never commit `.env` files to version control, especially `.env.production` which contains production credentials
+- Use `.env.example` as a template for creating new environment files
+- Create separate environment files for different deployment environments:
+  - `.env` - Local development
+  - `.env.staging` - Staging environment
+  - `.env.production` - Production environment
+- Always add all `.env` files to `.gitignore` to prevent accidental commits
+- Use environment variables for configuration to maintain security and flexibility
+- Rotate credentials regularly and use strong, unique passwords for each environment
+- Consider using a secrets management system for production environments
+- Never hardcode sensitive information in source code
 
 #### **Docker Security**
 

docs/setup/SETUP_COMPLETE.md

@@ -16,6 +16,13 @@ Your project now has comprehensive code quality tools configured:
 - **detect-secrets** - Security scanning to prevent secret commits
 - **EditorConfig** - Consistent coding styles across editors
 
+### 🛡️ Environment File Security
+
+- **Never commit .env files** to version control, especially .env.production
+- Use .env.example as a template for new environment files
+- Add all .env files to .gitignore to prevent accidental commits
+- Use environment variables for configuration to maintain security and flexibility
+
 ### 📁 Configuration Files Created
 
 - `.pre-commit-config.yaml` - Comprehensive pre-commit hooks configuration