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/app/menu_rules.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from typing import Any
+
+
+MENU_FIELDS = (
+    "parentId",
+    "name",
+    "type",
+    "path",
+    "componentKey",
+    "permissionCode",
+    "icon",
+    "sortOrder",
+    "isVisible",
+    "isActive",
+)
+
+
+def _clean_optional(value: Any) -> Any:
+    if isinstance(value, str):
+        return value.strip() or None
+    return value
+
+
+def normalize_menu_values(values: dict[str, Any], *, partial: bool = False) -> dict[str, Any]:
+    """Normalize menu form values and enforce type-specific fields."""
+    normalized = dict(values)
+    for field in ("parentId", "name", "path", "componentKey", "permissionCode", "icon"):
+        if field in normalized:
+            normalized[field] = _clean_optional(normalized[field])
+
+    if "name" in normalized and not normalized["name"]:
+        raise ValueError("菜单名称不能为空")
+
+    if partial or "type" not in normalized:
+        return normalized
+
+    menu_type = normalized["type"]
+    if menu_type == "button":
+        if not normalized.get("permissionCode"):
+            raise ValueError("按钮菜单必须填写权限标识")
+        if normalized.get("path") or normalized.get("componentKey"):
+            raise ValueError("按钮菜单不能填写路由地址或组件路径")
+        normalized["icon"] = None
+    else:
+        if not normalized.get("path"):
+            raise ValueError("目录或页面必须填写路由地址")
+        if menu_type == "page" and not normalized.get("componentKey"):
+            raise ValueError("页面菜单必须填写组件路径")
+        if menu_type == "directory":
+            normalized["permissionCode"] = None
+
+    return normalized