feat(core): 新增 WebP 图像压缩功能

在 `Cargo.toml` 和 `crates/core/Cargo.toml` 中添加了对 `webp` 库的依赖，以支持 WebP 图像格式的压缩。

在 `crates/core/src/image.rs` 中修改了图像压缩和缩略图生成的逻辑，使用 `webp::Encoder` 进行 WebP 格式的图像压缩。更新了注释以明确说明压缩为有损 WebP 格式。

Author: ExquisiteCore

Cargo.lock

@@ -44,6 +44,7 @@ bytes = "1"
 
 # Image processing
 image = { version = "0.25", default-features = false, features = ["jpeg", "png", "gif", "webp"] }
+webp = "0.3"
 
 # HTTP client
 reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }

Cargo.toml

@@ -21,5 +21,6 @@ dashmap.workspace = true
 rand.workspace = true
 tokio = { workspace = true }
 image.workspace = true
+webp.workspace = true
 reqwest.workspace = true
 regex.workspace = true

crates/core/Cargo.toml

@@ -116,22 +116,19 @@ impl ImageService {
         let width = img.width() as i32;
         let height = img.height() as i32;
 
-        // 6. Compress to WebP
+        // 6. Compress to WebP (lossy)
         let webp_data = {
-            let mut buf = Cursor::new(Vec::new());
-            img.write_to(&mut buf, image::ImageFormat::WebP)
-                .map_err(|e| AppError::Internal(format!("WebP 编码失败: {e}")))?;
-            buf.into_inner()
+            let encoder = webp::Encoder::from_image(&img)
+                .map_err(|e| AppError::Internal(format!("WebP 编码器创建失败: {e}")))?;
+            encoder.encode(config.compression_quality as f32).to_vec()
         };
 
         // 7. Generate 300x300 thumbnail
         let thumb_data = {
             let thumb = img.thumbnail(300, 300);
-            let mut buf = Cursor::new(Vec::new());
-            thumb
-                .write_to(&mut buf, image::ImageFormat::WebP)
-                .map_err(|e| AppError::Internal(format!("缩略图生成失败: {e}")))?;
-            buf.into_inner()
+            let encoder = webp::Encoder::from_image(&thumb)
+                .map_err(|e| AppError::Internal(format!("缩略图编码器创建失败: {e}")))?;
+            encoder.encode(config.compression_quality as f32).to_vec()
         };
 
         let size = webp_data.len() as i64;