Remove hardcoded API keys, use environment variables only

- All API keys now read from environment variables (secrets in HF Spaces)
- Removed hardcoded keys from config.py
- Added SECRETS_SETUP.md with detailed instructions
- Updated app.py for HF Spaces compatibility
- Updated README_HF_SPACES.md with secrets setup guide

README_HF_SPACES.md

@@ -9,11 +9,17 @@ This is the deployment guide for hosting AI Radio on HuggingFace Spaces.
    - Set the hardware to "CPU" (or "GPU" if available)
 
 2. **Configure Secrets** in your Space settings:
-   Go to Settings → Secrets and add the following:
-   - `ELEVENLABS_API_KEY` - Your ElevenLabs API key
-   - `NEBIUS_API_KEY` - Your Nebius API key (for GPT-OSS-120B)
-   - `LLAMAINDEX_API_KEY` - Your LlamaIndex API key (optional, for embeddings)
-   - `OPENAI_API_KEY` - Optional, for OpenAI embeddings fallback
+   Go to **Settings → Secrets** and add the following:
+   
+   **Required Secrets:**
+   - `ELEVENLABS_API_KEY` - Your ElevenLabs API key (for text-to-speech)
+   - `NEBIUS_API_KEY` - Your Nebius API key (for GPT-OSS-120B LLM)
+   
+   **Optional Secrets:**
+   - `LLAMAINDEX_API_KEY` - Your LlamaIndex API key (for embeddings, fallback to local)
+   - `OPENAI_API_KEY` - OpenAI API key (for embeddings fallback, optional)
+   
+   📖 **Detailed instructions:** See `SECRETS_SETUP.md` for step-by-step guide
 
 3. **Push your code** to the Space repository
 

app.py

@@ -10,9 +10,6 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), "src"))
 from app import demo
 
 if __name__ == "__main__":
-    demo.launch(
-        server_name="0.0.0.0",
-        server_port=7860,  # HF Spaces default port
-        share=False
-    )
+    # HF Spaces automatically handles server_name and server_port
+    demo.launch()