修 Gitee 附件清理：assets 字段没 id，要用 attach_files 接口

Gitee 的坑：GET /releases/{id} 返回的 assets 里
**只有 name 和 download_url，没有 id**，
照着它删是删不掉的（之前静默失败，附件一路堆到 11 个）。

必须换接口才拿得到 id：
    GET    /releases/{id}/attach_files        -> [{id, name, size}]
    DELETE /releases/{id}/attach_files/{id}

已清理：Gitee 11 -> 5 个（含 2 个自动生成的源码包），
EzHub 5 -> 3 个。清理动作也加了重试（网络会抖）。

_build/release_all.py

@@ -133,27 +133,41 @@ def gitee_release(token: str, version: str, body: str,
             return False
 
     # 复用已有发行版时先把同名旧附件删掉，否则每跑一次多一份。
+    #
+    # ⚠ Gitee 的坑：`GET /releases/{id}` 返回的 `assets` **只有 name 和
+    #   download_url，没有 id**，照着它删是删不掉的。
+    #   必须换成单独这个接口才带 id：
+    #       GET /releases/{id}/attach_files      -> [{id, name, size, ...}]
+    #   删也是：DELETE /releases/{id}/attach_files/{attach_id}
     try:
         with urllib.request.urlopen(
-                "%s/releases/%s?access_token=%s" % (api, rid, token),
-                timeout=60) as resp:
-            existing = json.loads(resp.read().decode("utf-8", "replace"))
+                "%s/releases/%s/attach_files?access_token=%s"
+                % (api, rid, token), timeout=90) as resp:
+            old_assets = json.loads(resp.read().decode("utf-8", "replace"))
+        if not isinstance(old_assets, list):
+            old_assets = []
         wanted = {p.name for p in files}
-        # Gitee 叫 attach_files，Gitea 叫 assets
-        old_assets = (existing.get("assets")
-                      or existing.get("attach_files") or [])
         for asset in old_assets:
-            name = asset.get("name") or asset.get("filename")
+            name = asset.get("name")
             aid = asset.get("id")
             if name in wanted and aid:
                 del_url = ("%s/releases/%s/attach_files/%s"
                            "?access_token=%s" % (api, rid, aid, token))
                 dreq = urllib.request.Request(del_url, method="DELETE")
-                try:
-                    urllib.request.urlopen(dreq, timeout=60)
-                    print("    • 删掉同名旧附件 %s" % name)
-                except urllib.error.HTTPError as exc:
-                    print("    • 删 %s 失败 HTTP %s（继续）" % (name, exc.code))
+                for attempt in range(1, 4):
+                    try:
+                        urllib.request.urlopen(dreq, timeout=90)
+                        print("    • 删掉同名旧附件 %s" % name)
+                        break
+                    except urllib.error.HTTPError as exc:
+                        print("    • 删 %s 失败 HTTP %s（继续）"
+                              % (name, exc.code))
+                        break
+                    except Exception:                 # noqa: BLE001
+                        if attempt == 3:
+                            print("    • 删 %s 网络失败，跳过" % name)
+                        else:
+                            time.sleep(4)
     except Exception as exc:                           # noqa: BLE001
         print("    • 清理旧附件时出错（继续）: %s" % exc)