feat(update): add forced upgrade progress flow

app/update_installer.py

@@ -377,17 +377,25 @@ def load_verified_pending(install_root, metadata):
         return None
 
 
-def prepare_update(metadata, install_root, **download_kwargs):
+def prepare_update(metadata, install_root, stage_callback=None, **download_kwargs):
     validate_metadata(metadata, download_kwargs.get("trusted_hosts", DEFAULT_TRUSTED_HOSTS))
+    if stage_callback:
+        stage_callback("正在检查已下载的新版")
     reusable = load_verified_pending(install_root, metadata)
     if reusable is not None:
+        if stage_callback:
+            stage_callback("新版已经完成校验")
         return reusable
     update_root = _update_root(install_root)
+    if stage_callback:
+        stage_callback("正在下载新版")
     zip_path = download_package(metadata, install_root, **download_kwargs)
     staging_parent = update_root / "staging"
     staging_parent.mkdir(parents=True, exist_ok=True)
     staging_dir = staging_parent / (metadata.version + "-" + uuid.uuid4().hex[:12])
     try:
+        if stage_callback:
+            stage_callback("正在校验并准备新版")
         safe_extract(zip_path, staging_dir)
         validate_staging(staging_dir, metadata)
         pending_path = _write_pending(update_root, metadata, staging_dir, zip_path)
@@ -395,4 +403,6 @@ def prepare_update(metadata, install_root, **download_kwargs):
         if staging_dir.exists():
             shutil.rmtree(str(staging_dir), ignore_errors=True)
         raise
+    if stage_callback:
+        stage_callback("新版已经完成校验")
     return StagedUpdate(metadata.version, zip_path, staging_dir, pending_path, metadata.sha256)