Update app.py

app.py

@@ -36,7 +36,7 @@ def _(Optional, httpx, json, os):
 
             # Set up headers and endpoints based on provider
             if self.provider == 'openai':
-                self.api_key = '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'
+                self.api_key = os.environ.get('OPENROUTER_API_KEY')
                 if not self.api_key:
                     raise ValueError('OPENAI_API_KEY environment variable not set')
                 self.headers = {'Content-Type': 'application/json', 'Authorization': f'Bearer {self.api_key}'}