chore: fix all clippy warnings and add Cargo.toml metadata

src/api/util.rs

@@ -158,7 +158,7 @@ pub(crate) fn parse_data_uri(url: &str) -> Option<ImageData> {
 /// Supports:
 /// - Chat Completions: `{"type": "image_url", "image_url": {"url": "data:..."}}`
 /// - Responses API:    `{"type": "input_image", "image_url": "data:..."}` or
-///                     `{"type": "input_image", "url": "data:..."}`
+///   `{"type": "input_image", "url": "data:..."}`
 pub(crate) fn extract_image_from_content(item: &serde_json::Value) -> Option<ImageData> {
     let item_type = item["type"].as_str().unwrap_or("");