add web UI: search, download queue with progress, cancel

- ui/index.html, ui/styles.css, ui/scripts.js — minimal two-tab UI
- Search tab: big search bar, results with size/votes, add-to-queue button
- Queue tab: progress bar, speed, downloaded/total, status badges, cancel
- Switches to queue tab on load if downloads are active
- Backend: GET /api/search, POST /api/queue/add, GET /api/queue, POST /api/queue/cancel
- Speed tracking in streamToFile, abort tracking for immediate cancel
- No rounded corners, dark theme

README.md

@@ -11,6 +11,7 @@ Official Webshare HTTP API documentation: [https://webshare.cz/apidoc/](https://
 | **Stream** | `GET /stream/:ident` | Fresh Webshare `file_link` + HTTP 302 to CDN |
 | **Fake qBittorrent** | `/api/v2/*` | Download client API; streams the HTTPS file to disk |
 | **Debug** | `GET /resolve/:ident` | JSON with the resolved CDN URL |
+| **Web UI** | `GET /` | Two-tab UI: search files and add to queue; queue view with progress, speed, and cancel |
 | **MCP server** | `POST /mcp` (Streamable HTTP) | Tools for AI agents: search, resolve links, login check |
 
 Webshare download links expire after roughly ten minutes, so the torrent never embeds a CDN URL—only a path on this service that resolves a fresh link at fetch time.
@@ -28,6 +29,7 @@ src/
   mcp-server.js  # MCP tool registration (shared)
   mcp-http.js    # Streamable HTTP transport mount for Express
   mcp.js         # Optional MCP-only HTTP process
+  ui/            # Web UI: search & queue management
 __tests__/
 compose.yaml
 Dockerfile