fix(profile): restore source hints and upload-only avatar

frontend/src/i18n/locales/en.ts

@@ -943,11 +943,10 @@ export default {
     },
     avatar: {
       title: 'Profile Avatar',
-      description: 'Set your avatar with a remote image URL or upload an image. Static uploads are compressed to 20KB before saving.',
-      inputLabel: 'Avatar URL or data URL',
-      inputPlaceholder: 'https://cdn.example.com/avatar.png',
+      description: 'Upload an avatar image. Static uploads are compressed to 20KB before saving.',
       uploadAction: 'Upload image',
       uploadHint: 'Static uploads are compressed to 20KB when possible. GIF uploads must already be within 20KB.',
+      uploadRequired: 'Upload an avatar image first',
       saveSuccess: 'Avatar updated',
       deleteSuccess: 'Avatar removed',
       invalidType: 'Please choose an image file',
@@ -955,7 +954,6 @@ export default {
       compressTooLarge: 'Unable to compress this image below 20KB. Try a smaller image.',
       compressFailed: 'Failed to compress the selected image.',
       readFailed: 'Failed to read the selected image.',
-      invalidValue: 'Enter a valid avatar URL or image data URL',
       emptyDeleteHint: 'Avatar is already empty',
     },
     authBindings: {

frontend/src/i18n/locales/zh.ts

@@ -947,11 +947,10 @@ export default {
     },
     avatar: {
       title: '资料头像',
-      description: '支持填写远程图片 URL，或上传头像图片；静态图片会自动压缩到 20KB 以内后再保存。',
-      inputLabel: '头像 URL 或 data URL',
-      inputPlaceholder: 'https://cdn.example.com/avatar.png',
+      description: '仅支持上传头像图片；静态图片会自动压缩到 20KB 以内后再保存。',
       uploadAction: '上传图片',
       uploadHint: '上传图片时会自动压缩静态图片到 20KB 以内，GIF 需自行控制在 20KB 以内',
+      uploadRequired: '请先上传头像图片',
       saveSuccess: '头像已更新',
       deleteSuccess: '头像已删除',
       invalidType: '请选择图片文件',
@@ -959,7 +958,6 @@ export default {
       compressTooLarge: '无法将图片压缩到 20KB 以内，请换一张更小的图片',
       compressFailed: '压缩所选图片失败',
       readFailed: '读取所选图片失败',
-      invalidValue: '请输入有效的头像 URL 或图片 data URL',
       emptyDeleteHint: '当前没有可删除的头像',
     },
     authBindings: {