feat: 页面配置key改为枚举下拉框+自动填method

par-api/src/main/java/com/par/api/controller/SitePagesController.java

@@ -91,6 +91,15 @@ public class SitePagesController {
         return ApiResponse.success(Map.of("siteId", siteId, "version", version, "content", content));
     }
 
+    /** 获取页面入口 key 枚举列表 */
+    @GetMapping("/api/v1/admin/page-keys")
+    public ApiResponse<List<Map<String, String>>> pageKeys() {
+        var list = java.util.Arrays.stream(com.par.core.enums.PageKey.values())
+                .map(pk -> Map.of("key", pk.getKey(), "label", pk.getLabel(), "defaultMethod", pk.getDefaultMethod()))
+                .toList();
+        return ApiResponse.success(list);
+    }
+
     @GetMapping("/api/v1/admin/default-pages/{type}")
     public ApiResponse<Map<String, Object>> getDefaultPages(@PathVariable String type, HttpServletRequest request) {
         checkAdmin(request);