feat(s3): enhance logging and public URL generation

Add detailed logging for S3 uploads in user and content services. Improve public URL generation logic in `S3Service` by providing better handling for `API_URL`, `DOMAIN_NAME`, and `PORT`. Update relevant tests to cover all scenarios.

backend/src/media/media.controller.spec.ts

@@ -28,12 +28,13 @@ describe("MediaController", () => {
 	});
 
 	describe("getFile", () => {
-		it("should stream the file and set headers", async () => {
+		it("should stream the file and set headers with path containing slashes", async () => {
 			const res = {
 				setHeader: jest.fn(),
 			} as any;
 			const stream = new Readable();
 			stream.pipe = jest.fn();
+			const key = "contents/user-id/test.webp";
 
 			mockS3Service.getFileInfo.mockResolvedValue({
 				size: 100,
@@ -41,8 +42,9 @@ describe("MediaController", () => {
 			});
 			mockS3Service.getFile.mockResolvedValue(stream);
 
-			await controller.getFile("test.webp", res);
+			await controller.getFile(key, res);
 
+			expect(mockS3Service.getFileInfo).toHaveBeenCalledWith(key);
 			expect(res.setHeader).toHaveBeenCalledWith("Content-Type", "image/webp");
 			expect(res.setHeader).toHaveBeenCalledWith("Content-Length", 100);
 			expect(stream.pipe).toHaveBeenCalledWith(res);