Enhance image generation functionality by adding support for aspect r…

…atio in Gemini API requests, improving error handling, and integrating tracing for better logging. Update dependencies in Cargo.toml and Cargo.lock to include tracing and related libraries.

Update GeminiResponse struct to make predictions optional and enhance…

… error handling in generate_image_from_gemini function for improved robustness.

Enhance README.md and main.rs to support additional optional environm…

…ent variables for server configuration, including SERVER_LISTEN_ADDR, SERVER_PORT, and IMAGE_RESOURCE_SERVER_ADDR, improving flexibility for deployment.

Remove rust.yml workflow file from GitHub Actions configuration.

Update README.md to include optional BASE_URL configuration for proxy…

… and modify main.rs to use BASE_URL for API requests.

Refactor response handling in generate_image_from_gemini to parse Gem…

…iniResponse from text, adding error handling for parsing failures.

Implement additional server capabilities in main.rs to improve functi…

…onality