feat(admin, admin-ui): 实现RuoYi风格后台菜单管理，优化媒体资源处理

新增服务端菜单校验与归一化逻辑，完善菜单相关Schema；前端实现条件渲染的菜单编辑器，支持搜索式图标选择器与父级树过滤。新增媒体URL统一处理工具修复管理端本地静态资源路径映射问题，更新全部相关文档、技术决策记录与测试用例。本次变更不影响WonderQ-MiniAPP端。

WonderQ-Admin/tests/test_media_urls.py

@@ -68,6 +68,7 @@ def test_resolve_media_fields_signs_common_image_fields(monkeypatch):
             "image": "oss-image",
             "avatar": "oss-avatar",
             "qrImage": "oss-qr",
+            "url": "oss-url",
             "gallery": ["oss-gallery-1", "oss-gallery-2"],
             "label": "unchanged",
         }
@@ -77,6 +78,7 @@ def test_resolve_media_fields_signs_common_image_fields(monkeypatch):
         "image": "signed:oss-image",
         "avatar": "signed:oss-avatar",
         "qrImage": "signed:oss-qr",
+        "url": "signed:oss-url",
         "gallery": ["signed:oss-gallery-1", "signed:oss-gallery-2"],
         "label": "unchanged",
     }