[backend] fix: 修复异常处理和类型转换问题

frontend/node_modules/rc-dropdown/es/placements.d.ts

@@ -0,0 +1,57 @@
+declare const placements: {
+    topLeft: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+    top: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+    topRight: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+    bottomLeft: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+    bottom: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+    bottomRight: {
+        points: string[];
+        overflow: {
+            adjustX: number;
+            adjustY: number;
+        };
+        offset: number[];
+        targetOffset: number[];
+    };
+};
+export default placements;