fix(download): add Referer header for AllAnime CDN URLs

allanime.day CDN requires Referer: https://allanime.to for authenticated
requests. Without it, HEAD and Range GET requests return 401, breaking
multi-part downloads and content-length detection.

- Add allanime.day to isKnownStreamURL check in getContentLength()
- Set Referer on HEAD request in getContentLength() for allanime URLs
- Set Referer on Range GET request in downloadPart() for allanime URLs

Author: Vittuu

internal/player/download.go

@@ -74,6 +74,9 @@ func downloadPart(url string, from, to int64, part int, client *http.Client, des
 			return err
 		}
 		req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", current, to))
+		if strings.Contains(url, "allanime.day") || strings.Contains(url, "allanime.pro") {
+			req.Header.Set("Referer", "https://allanime.to")
+		}
 
 		resp, err := client.Do(req) // #nosec G704
 		if err != nil {

internal/player/scraper.go

@@ -85,6 +85,7 @@ func getContentLength(url string, client *http.Client) (int64, error) {
 		strings.Contains(url, "master.m3u8") ||
 		strings.Contains(url, ".m3u8") ||
 		strings.Contains(url, "allanime.pro") ||
+		strings.Contains(url, "allanime.day") ||
 		strings.Contains(url, "animefire") ||
 		strings.Contains(url, "blogger.com") ||
 		strings.Contains(url, "animesfire") ||
@@ -96,6 +97,9 @@ func getContentLength(url string, client *http.Client) (int64, error) {
 		// Returns 0 and the error if the request creation fails.
 		return 0, err
 	}
+	if strings.Contains(url, "allanime.day") || strings.Contains(url, "allanime.pro") {
+		req.Header.Set("Referer", "https://allanime.to")
+	}
 
 	// Sends the HEAD request to the server.
 	resp, err := client.Do(req) // #nosec G704