feat(media): add image resizing support for processImage

Extend the `processImage` method to support optional resizing with `width` and `height` parameters. Update processing pipeline to handle resizing while maintaining existing format processing for `webp` and `avif`.

backend/src/common/interfaces/media.interface.ts

@@ -17,6 +17,7 @@ export interface IMediaService {
 	processImage(
 		buffer: Buffer,
 		format?: "webp" | "avif",
+		resize?: { width?: number; height?: number },
 	): Promise<MediaProcessingResult>;
 	processVideo(
 		buffer: Buffer,

backend/src/media/media.service.ts

@@ -83,8 +83,9 @@ export class MediaService implements IMediaService {
 	async processImage(
 		buffer: Buffer,
 		format: "webp" | "avif" = "webp",
+		resize?: { width?: number; height?: number },
 	): Promise<MediaProcessingResult> {
-		return this.imageProcessor.process(buffer, { format });
+		return this.imageProcessor.process(buffer, { format, resize });
 	}
 
 	async processVideo(

backend/src/media/strategies/image-processor.strategy.ts

@@ -13,11 +13,22 @@ export class ImageProcessorStrategy implements IMediaProcessorStrategy {
 
 	async process(
 		buffer: Buffer,
-		options: { format: "webp" | "avif" } = { format: "webp" },
+		options: {
+			format: "webp" | "avif";
+			resize?: { width?: number; height?: number };
+		} = { format: "webp" },
 	): Promise<MediaProcessingResult> {
 		try {
-			const { format } = options;
+			const { format, resize } = options;
 			let pipeline = sharp(buffer);
+
+			if (resize) {
+				pipeline = pipeline.resize(resize.width, resize.height, {
+					fit: "cover",
+					position: "center",
+				});
+			}
+
 			const metadata = await pipeline.metadata();
 
 			if (format === "webp") {