feat(ui): add verification badge to UserProfileHeader

Add verification status display with identity-based badge icons to the user
profile header component. Also add identity and verification_status fields
to UserDTO and UserDetailDTO types.

- Add VerificationBadge component with icon display based on identity type
- Support for student, teacher, staff, alumni, and external identity types
- Add 'none' status to VerificationStatus type for unverified users

src/types/dto.ts

@@ -23,6 +23,8 @@ export interface UserDTO {
   created_at: string;
   is_following?: boolean;
   is_following_me?: boolean;
+  identity?: UserIdentity;
+  verification_status?: VerificationStatus;
 }
 
 export interface UserDetailDTO {
@@ -43,6 +45,8 @@ export interface UserDetailDTO {
   // 额外字段
   is_following?: boolean;      // 当前用户是否关注了该用户
   is_following_me?: boolean;   // 该用户是否关注了当前用户
+  identity?: UserIdentity;
+  verification_status?: VerificationStatus;
 }
 
 // ==================== Post DTOs ====================
@@ -858,7 +862,7 @@ export interface CreateVotePostRequest {
 
 // ==================== Verification DTOs ====================
 
-export type VerificationStatus = 'not_submitted' | 'pending' | 'approved' | 'rejected';
+export type VerificationStatus = 'not_submitted' | 'pending' | 'approved' | 'rejected' | 'none';
 export type UserIdentity = 'general' | 'student' | 'teacher' | 'staff' | 'alumni' | 'external';
 
 export interface VerificationStatusDTO {