first commit

src/services/download.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { Observable } from 'rxjs';
+
+export interface DownloadFormat {
+  id: string;
+  resolution?: string;
+  fps?: number;
+  ext?: string;
+  vcodec?: string;
+  acodec?: string;
+  sizeEstimate?: number;
+  label: string;
+}
+
+export type DownloadState = 'queued' | 'running' | 'merging' | 'completed' | 'failed';
+
+export interface DownloadJob {
+  id: string;
+  userId: string;
+  provider: string;
+  videoId: string;
+  state: DownloadState;
+  progress: number;
+  createdAt: string;
+  updatedAt: string;
+  filePath?: string | null;
+  fileExt?: string | null;
+  fileSize?: number | null;
+  error?: string | null;
+  url?: string;
+}
+
+@Injectable({ providedIn: 'root' })
+export class DownloadService {
+  constructor(private http: HttpClient) {}
+
+  listFormats(
+    provider: string,
+    videoId: string,
+    opts?: { instance?: string; slug?: string; sourceUrl?: string }
+  ): Observable<{ url: string; formats: DownloadFormat[]; title: string; duration: number }> {
+    let params = new HttpParams();
+    if (opts?.instance) params = params.set('instance', opts.instance);
+    if (opts?.slug) params = params.set('slug', opts.slug);
+    if (opts?.sourceUrl) params = params.set('sourceUrl', opts.sourceUrl);
+    return this.http.get<{ url: string; formats: DownloadFormat[]; title: string; duration: number }>(
+      `/proxy/api/download/${encodeURIComponent(provider)}/${encodeURIComponent(videoId)}/formats`,
+      { params, withCredentials: true }
+    );
+  }
+
+  startDownload(
+    provider: string,
+    videoId: string,
+    body?: { formatId?: string; audioOnly?: boolean; sourceUrl?: string },
+    opts?: { instance?: string; slug?: string }
+  ): Observable<{ jobId: string }> {
+    let params = new HttpParams();
+    if (opts?.instance) params = params.set('instance', opts.instance);
+    if (opts?.slug) params = params.set('slug', opts.slug);
+    return this.http.post<{ jobId: string }>(
+      `/proxy/api/download/${encodeURIComponent(provider)}/${encodeURIComponent(videoId)}`,
+      body || {},
+      { params, withCredentials: true }
+    );
+  }
+
+  getJob(id: string): Observable<DownloadJob> {
+    return this.http.get<DownloadJob>(`/proxy/api/download/jobs/${encodeURIComponent(id)}`, { withCredentials: true });
+  }
+
+  cancelJob(id: string): Observable<void> {
+    return this.http.delete<void>(`/proxy/api/download/jobs/${encodeURIComponent(id)}`, { withCredentials: true });
+  }
+
+  fileUrl(id: string): string {
+    return `/proxy/api/download/jobs/${encodeURIComponent(id)}/file`;
+  }
+}