feat: add Dailymotion + Reddit downloader endpoints via yt-dlp

New platforms from Shirokami-style downloadter set:
- /download/dailymotion: real MP4/HLS streams (288p up to 2160p)
- /download/reddit: real v.redd.it HLS media for public posts
- detect + all-in-one dispatch updated

Both verified working from VPS with real URLs.

src/presentation/handler/downloader.rs

@@ -195,6 +195,22 @@ pub async fn download_soundcloud(
     Ok(Json(DownloadResponse::ok(result)))
 }
 
+/// Handler for _dailymotion.
+pub async fn download_dailymotion(
+    Query(params): Query<DownloadParams>,
+) -> Result<Json<DownloadResponse>, AppError> {
+    let result = use_cases::download_dailymotion(&params.url).await?;
+    Ok(Json(DownloadResponse::ok(result)))
+}
+
+/// Handler for _reddit.
+pub async fn download_reddit(
+    Query(params): Query<DownloadParams>,
+) -> Result<Json<DownloadResponse>, AppError> {
+    let result = use_cases::download_reddit(&params.url).await?;
+    Ok(Json(DownloadResponse::ok(result)))
+}
+
 /// Handler for _bilibili.
 pub async fn download_bilibili(
     Query(params): Query<DownloadParams>,

src/presentation/router.rs

@@ -236,6 +236,14 @@ pub fn build_router(app_state: Arc<AppState>) -> anyhow::Result<Router> {
             "/download/soundcloud",
             axum::routing::get(crate::presentation::handler::downloader::download_soundcloud),
         )
+        .route(
+            "/download/dailymotion",
+            axum::routing::get(crate::presentation::handler::downloader::download_dailymotion),
+        )
+        .route(
+            "/download/reddit",
+            axum::routing::get(crate::presentation::handler::downloader::download_reddit),
+        )
         .route(
             "/download/bilibili",
             axum::routing::get(crate::presentation::handler::downloader::download_bilibili),