chore: 统一代码风格并配置ESLint和Prettier

配置ESLint和Prettier规则
添加前端和后端的忽略文件
统一代码格式和缩进
修复代码风格问题

frontend/src/index.css

@@ -5,9 +5,9 @@
 }
 
 body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
+  font-family:
+    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell',
+    'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
   background-color: #f5f7fa;
@@ -149,19 +149,24 @@ body {
   transform: translateY(-1px);
 }
 
-.ant-input, .ant-select-selector, .ant-picker {
+.ant-input,
+.ant-select-selector,
+.ant-picker {
   border-radius: 8px !important;
   border: 1px solid #d9d9d9 !important;
   transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
   box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05) !important;
 }
 
-.ant-input:hover, .ant-select-selector:hover, .ant-picker:hover {
+.ant-input:hover,
+.ant-select-selector:hover,
+.ant-picker:hover {
   border-color: #40a9ff !important;
   box-shadow: 0 2px 6px rgba(24, 144, 255, 0.15) !important;
 }
 
-.ant-input:focus, .ant-input-focused,
+.ant-input:focus,
+.ant-input-focused,
 .ant-select-focused .ant-select-selector,
 .ant-picker-focused {
   border-color: #1890ff !important;
@@ -188,7 +193,8 @@ body {
   box-shadow: 0 2px 6px rgba(24, 144, 255, 0.15) !important;
 }
 
-.ant-input-affix-wrapper:focus, .ant-input-affix-wrapper-focused {
+.ant-input-affix-wrapper:focus,
+.ant-input-affix-wrapper-focused {
   border-color: #1890ff !important;
   box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.15) !important;
 }
@@ -881,4 +887,4 @@ body {
 .welcome-banner p {
   color: rgba(255, 255, 255, 0.9);
   margin: 0;
-}
+}