feat: dSYM 按上传配置一并保存到远端，本地清理后回退到远端地址下载

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/routers/tasks.py

@@ -8,7 +8,7 @@ import uuid
 from datetime import datetime
 from typing import List
 from fastapi import APIRouter, Depends, HTTPException, Request
-from fastapi.responses import FileResponse
+from fastapi.responses import FileResponse, RedirectResponse
 from starlette.background import BackgroundTask
 from sqlalchemy.orm import Session
 
@@ -205,6 +205,25 @@ async def delete_task(task_id: str, request: Request, user: dict = Depends(get_c
         except (json.JSONDecodeError, DistributionError) as exc:
             raise HTTPException(status_code=502, detail=f"远端产物删除失败，记录未删除：{exc}") from exc
 
+    # dSYM 压缩包的远端对象键与 IPA 独立，同一版本/分支重复打包会复用并覆盖同一个远端文件，
+    # 仍有其他历史记录引用时不能删除。
+    has_shared_dsym = bool(
+        task.dsym_url and db.query(Task).filter(
+            Task.id != task.id,
+            Task.dsym_url == task.dsym_url,
+        ).first()
+    )
+    if task.dsym_url and not has_shared_dsym:
+        if not task.config_json:
+            raise HTTPException(status_code=400, detail="缺少打包配置快照，无法安全删除远端 dSYM 文件")
+        try:
+            build_config = json.loads(task.config_json)
+            from .config import load_config
+            from ..services.distribution import DistributionError, delete_published_dsym
+            delete_published_dsym(build_config, load_config().get("upload", {}))
+        except (json.JSONDecodeError, DistributionError) as exc:
+            raise HTTPException(status_code=502, detail=f"远端 dSYM 删除失败，记录未删除：{exc}") from exc
+
     # 删除日志文件
     log_path = Path(__file__).parent.parent / "logs" / f"{task_id}.log"
     if log_path.exists():
@@ -302,7 +321,7 @@ async def get_download_link(task_id: str, request: Request, user: dict = Depends
 
 @router.get("/{task_id}/dsym")
 async def download_dsym(task_id: str, request: Request, user: dict = Depends(get_current_user), db: Session = Depends(get_db)):
-    """下载 dSYM 文件"""
+    """下载 dSYM 文件：本地文件已被清理时回退到构建时上传保存的远端地址"""
     import shutil
     import zipfile
     import tempfile
@@ -310,17 +329,23 @@ async def download_dsym(task_id: str, request: Request, user: dict = Depends(get
     task = db.query(Task).filter(Task.id == task_id).first()
     if not task:
         raise HTTPException(status_code=404, detail="任务不存在")
-    if not task.dsym_path:
-        raise HTTPException(status_code=404, detail="dSYM 文件不存在")
-    from ..services.audit_log import record_operation
-    record_operation(db, user, "dsym_downloaded", request=request, task=task,
-                     resource_type="dsym", resource_name=os.path.basename(task.dsym_path))
-    db.commit()
 
     dsym_path = task.dsym_path
-    if not os.path.exists(dsym_path):
+    local_exists = bool(dsym_path) and os.path.exists(dsym_path)
+    if not local_exists and not task.dsym_url:
+        if not dsym_path:
+            raise HTTPException(status_code=404, detail="dSYM 文件不存在")
         raise HTTPException(status_code=404, detail="dSYM 文件已被清理")
 
+    from ..services.audit_log import record_operation
+    resource_name = os.path.basename(dsym_path) if dsym_path else os.path.basename(task.dsym_url)
+    record_operation(db, user, "dsym_downloaded", request=request, task=task,
+                     resource_type="dsym", resource_name=resource_name)
+    db.commit()
+
+    if not local_exists:
+        return RedirectResponse(task.dsym_url)
+
     # .dSYM 是目录（macOS bundle），需要压缩为 zip 再下载
     if os.path.isdir(dsym_path):
         zip_path = os.path.join(tempfile.gettempdir(), os.path.basename(dsym_path) + ".zip")