feat: Enhance audio capture and monitoring features

- Added "audioCapture" permission to manifest for microphone access.
- Introduced DeepSeek as a new AI provider option in the side panel.
- Implemented a capture mode selection (tab-only, mic-only, mixed) in the side panel.
- Added options to enable/disable the extension and auto-open the assistant window.
- Integrated a mic monitor feature with live input level visualization.
- Included buttons for requesting microphone permission and granting tab access.
- Updated styles for new sections and mic level visualization.
- Enhanced model fetching logic to support DeepSeek and improved error handling.

AI_PROVIDERS_GUIDE.md

@@ -22,6 +22,12 @@ Your AI Interview Assistant now supports multiple AI providers! Here's how to se
 - **Recommended Model**: Gemini-1.5-Flash (fast and efficient)
 - **Cost**: Free tier available, then pay per token
 
+## 🌊 **DeepSeek**
+- **Models Available**: DeepSeek-Chat, DeepSeek-Reasoner
+- **API Key**: Get from [DeepSeek Platform](https://platform.deepseek.com/)
+- **Recommended Model**: DeepSeek-Chat (general use)
+- **Cost**: Pay per token usage
+
 ## 🏠 **Ollama (Local)**
 - **Models Available**: Llama3.2, Llama3.1, Mistral, CodeLlama, Phi3
 - **Setup**: Install [Ollama](https://ollama.ai/) locally