feat(challenges): 添加自定义挑战类型并优化字段验证

- 新增 CUSTOM 挑战类型支持
- 移除 requirementLabel 必填验证，改为可选字段
- 添加挑战类型选择器的编辑模式禁用状态
- 优化日期选择器的多语言支持
- 完善中英文国际化文案
- 修复空 requirementLabel 导致的渲染问题

i18n/index.ts

@@ -1210,10 +1210,12 @@ const resources = {
             sleep: '睡眠',
             mood: '心情',
             weight: '体重',
+            custom: '自定义',
           },
           fields: {
             title: '标题',
             titlePlaceholder: '挑战标题（最多100字）',
+            challengeTypeHelper: '饮水、睡眠类型会触发自动上报进度，也可以手动标记完成',
             coverImage: '封面图',
             uploadCover: '上传封面',
             challengeDescription: '挑战说明',
@@ -1275,6 +1277,7 @@ const resources = {
             clear: '清除',
             helper: '建议比例 16:9，清晰展示挑战氛围',
             selectSource: '选择封面图',
+            selectMessage: '请选择图片来源',
             camera: '拍照',
             album: '从相册选择',
             cancel: '取消',
@@ -1288,6 +1291,11 @@ const resources = {
             selectFailed: '选择失败',
             selectFailedMessage: '无法打开相册，请稍后再试',
           },
+          rankingDescription: '连续打卡榜',
+          datePicker: {
+            confirm: '确认',
+            cancel: '取消',
+          },
         },
       },
     },
@@ -2165,10 +2173,12 @@ const resources = {
             sleep: 'Sleep',
             mood: 'Mood',
             weight: 'Weight',
+            custom: 'Custom',
           },
           fields: {
             title: 'Title',
             titlePlaceholder: 'Challenge title (max 100 characters)',
+            challengeTypeHelper: 'Water and Sleep types auto-report progress and can also be manually marked as complete',
             coverImage: 'Cover Image',
             uploadCover: 'Upload Cover',
             challengeDescription: 'Challenge Description',
@@ -2243,6 +2253,11 @@ const resources = {
             selectFailed: 'Selection Failed',
             selectFailedMessage: 'Unable to open album, please try again later',
           },
+          rankingDescription: 'Continuous Check-in Leaderboard',
+          datePicker: {
+            confirm: 'Confirm',
+            cancel: 'Cancel',
+          },
         },
       },
     },