feat(release): 发版脚本支持扫描 dmg 安装包

- 新增 .dmg 文件扫描逻辑，给 macOS 新用户首次安装使用
- dmg 无签名文件，signature 设为空字符串

python-api/scripts/publish_release.py

@@ -105,6 +105,29 @@ def find_packages(bundle_dir: Path) -> list[dict]:
             "file_size": pkg_file.stat().st_size,
         })
 
+    # macOS DMG: 给新用户首次安装用（无签名文件）
+    for dmg_file in bundle_dir.rglob("*.dmg"):
+        filename = dmg_file.name
+
+        # 判断文件名是否包含架构标识
+        has_arch_marker = any(marker in filename for marker in ["aarch64", "arm64", "x86_64"])
+        if has_arch_marker:
+            arch = "aarch64" if "aarch64" in filename or "arm64" in filename else "x86_64"
+            archs = [arch]
+        else:
+            # Universal DMG：同时支持 x86_64 和 aarch64
+            archs = ["x86_64", "aarch64"]
+
+        for arch in archs:
+            packages.append({
+                "platform": "darwin",
+                "architecture": arch,
+                "filename": filename,
+                "local_path": str(dmg_file),
+                "signature": "",  # DMG 无签名（非 updater 包）
+                "file_size": dmg_file.stat().st_size,
+            })
+
     return packages