feat(17-02): refactor image service and routes to use S3 storage service

- Replace Bun.write/mkdir with uploadImage() from storage.service
- Remove uploadsDir parameter from fetchImageFromUrl
- Update tests to mock storage service instead of checking filesystem

src/server/services/image.service.ts

@@ -1,6 +1,5 @@
 import { randomUUID } from "node:crypto";
-import { mkdir } from "node:fs/promises";
-import { join } from "node:path";
+import { uploadImage } from "./storage.service";
 
 const ALLOWED_TYPES = ["image/jpeg", "image/png", "image/webp"];
 const MAX_SIZE = 5 * 1024 * 1024; // 5MB
@@ -13,7 +12,6 @@ interface FetchImageResult {
 
 export async function fetchImageFromUrl(
 	url: string,
-	uploadsDir = "uploads",
 ): Promise<FetchImageResult> {
 	// Validate URL format
 	let parsedUrl: URL;
@@ -74,9 +72,8 @@ export async function fetchImageFromUrl(
 	const ext = contentType === "image/jpeg" ? "jpg" : contentType.split("/")[1];
 	const filename = `${Date.now()}-${randomUUID()}.${ext}`;
 
-	// Ensure directory exists and write
-	await mkdir(uploadsDir, { recursive: true });
-	await Bun.write(join(uploadsDir, filename), buffer);
+	// Upload to object storage
+	await uploadImage(Buffer.from(buffer), filename, contentType);
 
 	return { filename, sourceUrl: url };
 }