feat: 补齐桌面端下载播放，并将窗口改为夜间主题和应用图标

server/services/http.py

@@ -89,6 +89,64 @@ class HttpClient:
             raise RuntimeError("不是图片")
         return response.content, media
 
+    def download_file(self, url: str, dest, on_chunk=None, stop=None) -> int:
+        from pathlib import Path
+
+        target = Path(dest)
+        target.parent.mkdir(parents=True, exist_ok=True)
+        temporary = target.with_name(target.name + ".part")
+        last_error = None
+        for _attempt in range(3):
+            if stop and stop():
+                raise RuntimeError("已取消")
+            try:
+                with self._client_locked().stream("GET", url, headers={"User-Agent": "RaptDrama"}) as response:
+                    response.raise_for_status()
+                    size = 0
+                    with temporary.open("wb") as handle:
+                        for chunk in response.iter_bytes(64 * 1024):
+                            if stop and stop():
+                                raise RuntimeError("已取消")
+                            if not chunk:
+                                continue
+                            handle.write(chunk)
+                            size += len(chunk)
+                            if on_chunk:
+                                on_chunk(len(chunk))
+                temporary.replace(target)
+                return size
+            except RuntimeError:
+                temporary.unlink(missing_ok=True)
+                raise
+            except (httpx.HTTPError, TimeoutError, OSError) as exc:
+                last_error = exc
+                temporary.unlink(missing_ok=True)
+                time.sleep(0.4)
+        raise RuntimeError(f"下载失败: {last_error}")
+
+    def read_text(self, url: str) -> str:
+        last_error = None
+        for _attempt in range(3):
+            try:
+                response = self._client_locked().get(url, headers={"User-Agent": "RaptDrama"})
+                response.raise_for_status()
+                return response.text
+            except (httpx.HTTPError, TimeoutError, OSError) as exc:
+                last_error = exc
+                time.sleep(0.4)
+        raise RuntimeError(f"下载失败: {last_error}")
+
+    def open_stream(self, url: str) -> httpx.Response:
+        client = self._client_locked()
+        request = client.build_request("GET", url, headers={"User-Agent": "RaptDrama"})
+        response = client.send(request, stream=True)
+        try:
+            response.raise_for_status()
+        except Exception:
+            response.close()
+            raise
+        return response
+
     def _close_locked(self) -> None:
         if self._client is not None:
             self._client.close()