refactor(settings): simplify environment toggle to use DEV variable only

.env.example

@@ -1,8 +1,9 @@
-# Django Production Settings
+# Mode Selection (DEV=true for local dev, DEV=false for live production)
+DEV=false
+
+# Django Settings
 DJANGO_SECRET_KEY=generate-a-strong-random-secret-key-here
-DJANGO_DEBUG=False
-ALLOWED_HOSTS=*
-CORS_ALLOW_ALL_ORIGINS=True
+ALLOWED_HOSTS=localhost,127.0.0.1,YOUR_SERVER_IP
 CSRF_TRUSTED_ORIGINS=http://localhost,http://127.0.0.1,http://YOUR_SERVER_IP
 
 # Database Configuration (PostgreSQL)
@@ -16,7 +17,7 @@ POSTGRES_PORT=5432
 REDIS_URL=redis://redis:6379/0
 
 # LLM Config (OpenAI / OpenRouter)
-OPENAI_API_KEY=sk-or-v1-your-openrouter-key
+OPENAI_API_KEY=sk-or-v1-your-openrouter-key-here
 OPENAI_MODEL=google/gemma-4-26b-a4b-it:free
 
 # Telegram Config

backend/config/settings.py

@@ -28,9 +28,8 @@ load_dotenv(BASE_DIR.parent / '.env')
 SECRET_KEY = os.getenv('DJANGO_SECRET_KEY', 'django-insecure-@8*97xo5!gdi!x*94-%n8$b63%ljy#@&^#7$h!9v-4a2#r+98t')
 
 # Environment setup (development / production)
-# Reads DEV=True/False or ENVIRONMENT='development'/'production'
-ENVIRONMENT = os.getenv('ENVIRONMENT', os.getenv('DJANGO_ENV', 'development')).lower()
-IS_DEV = os.getenv('DEV', 'True' if ENVIRONMENT in ('development', 'dev') else 'False').lower() in ('true', '1', 't')
+# Reads DEV=True for development, DEV=False for production
+IS_DEV = os.getenv('DEV', 'True').lower() in ('true', '1', 't')
 
 if IS_DEV:
     DEBUG = True