chore: consolidate env templates and remove Docker docs from master

- Merge .env.production.template into .env.example
- Remove Docker Deployment section from CLAUDE.md (now on docker branch)
- Update README.md to reference .env.example
- Update environment variable documentation

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -116,7 +116,7 @@ award/
 │       └── package.json
 ├── award-definitions/            # Award rule definitions (JSON)
 ├── award.db                     # SQLite database (auto-created)
-├── .env.production.template     # Production configuration template
+├── .env.example                 # Environment configuration template
 ├── bunfig.toml                  # Bun configuration
 ├── drizzle.config.js            # Drizzle ORM configuration
 ├── package.json
@@ -149,20 +149,32 @@ cp .env.example .env
 
 Edit `.env` with your configuration:
 ```env
-# Application URL (for production deployment)
-VITE_APP_URL=https://awards.dj7nt.de
+# Environment (development/production)
+NODE_ENV=development
+
+# Log Level (debug/info/warn/error)
+LOG_LEVEL=debug
+
+# Server Port (default: 3001)
+PORT=3001
+
+# Frontend URL (e.g., https://awards.dj7nt.de)
+# Leave empty for development (uses localhost)
+VITE_APP_URL=
 
 # API Base URL (leave empty for same-domain deployment)
 VITE_API_BASE_URL=
 
-# JWT Secret (generate with: openssl rand -base64 32)
-JWT_SECRET=your-generated-secret-here
+# Allowed CORS origins (comma-separated)
+# Add all domains that should access the API
+ALLOWED_ORIGINS=
 
-# Environment
-NODE_ENV=production
+# JWT Secret (generate with: openssl rand -base64 32)
+JWT_SECRET=change-this-in-production
 ```
 
-**For development**: You can leave `.env` empty or use defaults.
+**For development**: Use defaults above.
+**For production**: Set `NODE_ENV=production`, `LOG_LEVEL=info`, and generate a strong `JWT_SECRET`.
 
 4. Initialize the database with performance indexes:
 ```bash
@@ -414,20 +426,26 @@ bun run build
 Create `.env` in the project root:
 
 ```bash
-# Application URL
-VITE_APP_URL=https://awards.dj7nt.de
-
-# API Base URL (empty for same-domain)
-VITE_API_BASE_URL=
-
-# JWT Secret (generate with: openssl rand -base64 32)
-JWT_SECRET=your-generated-secret-here
-
 # Environment
 NODE_ENV=production
 
-# Database path (absolute path recommended)
-DATABASE_PATH=/path/to/award/award.db
+# Log Level (debug/info/warn/error)
+LOG_LEVEL=info
+
+# Server Port (default: 3001)
+PORT=3001
+
+# Frontend URL
+VITE_APP_URL=https://awards.dj7nt.de
+
+# API Base URL (leave empty for same-domain deployment)
+VITE_API_BASE_URL=
+
+# Allowed CORS origins (comma-separated)
+ALLOWED_ORIGINS=https://awards.dj7nt.de,https://www.awards.dj7nt.de
+
+# JWT Secret (generate with: openssl rand -base64 32)
+JWT_SECRET=your-generated-secret-here
 ```
 
 **Security**: Ensure `.env` has restricted permissions: