优化

auth/src/main/java/com/baiyue/auth/controller/InternalAccountController.java

@@ -40,6 +40,11 @@ public class InternalAccountController {
                                                @Valid @RequestBody CreateAccountRequest request) {
         verify(token); return ApiResponse.success(service.create(request));
     }
+    @GetMapping("/availability")
+    public ApiResponse<Boolean> availability(@RequestHeader(value="X-Internal-Service-Token", required=false) String token,
+                                             @RequestParam String username) {
+        verify(token); return ApiResponse.success(service.usernameAvailable(username));
+    }
     @GetMapping("/{id}")
     public ApiResponse<AccountSummary> summary(@RequestHeader(value="X-Internal-Service-Token", required=false) String token,
                                                 @PathVariable Long id) {

auth/src/main/java/com/baiyue/auth/service/AccountManagementService.java

@@ -21,6 +21,10 @@ public class AccountManagementService {
     @Resource private PasswordEncoder passwordEncoder;
     @Resource private TokenSessionStore tokenSessionStore;
 
+    public boolean usernameAvailable(String username) {
+        return username != null && !username.isBlank() && !repository.existsByUsername(username.trim());
+    }
+
     @Transactional
     @BusinessAudit(event = "PASSWORD_CHANGE", resourceType = "ACCOUNT", resourceId = "#accountId", description = "修改本人密码", captureAfter = false)
     public void changePassword(Long accountId, ChangePasswordRequest request) {