支持学生头像设置与展示（上传/清除）

src/i18n/locales/en-US.json

@@ -350,10 +350,12 @@
     "importList": "Import List",
     "addStudent": "Add Student",
     "name": "Name",
+    "avatar": "Avatar",
     "currentScore": "Current Points",
     "tags": "Tags",
     "noTags": "No tags",
     "editTags": "Edit Tags",
+    "editAvatar": "Set Avatar",
     "deleteConfirm": "Confirm delete this student?",
     "addTitle": "Add Student",
     "addConfirm": "Add",
@@ -379,7 +381,17 @@
     "selectNameColFirst": "Please select \"Name Column\" first",
     "noNamesFound": "No importable names found in selected column",
     "importFailed": "Import failed",
-    "editTagTitle": "Edit Tags - {{name}}"
+    "editTagTitle": "Edit Tags - {{name}}",
+    "editAvatarTitle": "Set Avatar - {{name}}",
+    "avatarUpload": "Upload Image",
+    "avatarClear": "Clear Avatar",
+    "noAvatar": "No Avatar",
+    "avatarTip": "Supports common image formats, up to 2MB",
+    "avatarSaveSuccess": "Avatar saved",
+    "avatarSaveFailed": "Failed to save avatar",
+    "avatarInvalidFile": "Please choose an image file",
+    "avatarTooLarge": "Image must be smaller than 2MB",
+    "avatarReadFailed": "Failed to read image"
   },
   "score": {
     "title": "Points Management",