Add Chinese README and Enhance Model API Response Format

[Anyexyz]

Changes Made

This PR makes two improvements to the project:

1. Added a comprehensive Chinese README (README.zh-CN.md) to improve accessibility for Chinese-speaking users
2. Updated the /v1/models endpoint response format to better match the OpenAI API standard

Detailed Changes

• Created a complete Chinese translation of the README with all key information preserved
• Added owned_by: "openai-edge-tts" field to model data in the API response
• Updated the get_models_formatted() function to include ownership information
• Maintained JSON structure consistency with OpenAI standard

Benefits

• Improves project accessibility for Chinese-speaking developers
• Enhances compatibility with applications that rely on the OpenAI API
• Enables seamless integration with third-party applications
• Maintains standardized API structure and documentation

Testing

• Verified all documentation links and formatting in the Chinese README
• Confirmed that the updated /v1/models endpoint returns the expected format with the following structure:

{
  "object": "list",
  "data": [
    {
      "id": "tts-1",
      "object": "model",
      "owned_by": "openai-edge-tts"
    },
    {
      "id": "tts-1-hd",
      "object": "model",
      "owned_by": "openai-edge-tts"
    },
    {
      "id": "gpt-4o-mini-tts",
      "object": "model",
      "owned_by": "openai-edge-tts"
    }
  ]
}