用户管理增加余额调账功能

支持后台加减可用余额并写入资金流水与审计，优化操作列按钮样式。

backend/internal/modules/adminuser/service.go

@@ -13,8 +13,15 @@ var (
 	ErrInvalidRealnameInput    = errors.New("invalid realname input")
 	ErrRealnameAlreadyVerified = errors.New("realname already verified")
 	ErrRealnameNotRevocable    = errors.New("realname not revocable")
+	ErrInvalidWalletDirection  = errors.New("invalid wallet direction")
+	ErrInvalidWalletAmount     = errors.New("invalid wallet amount")
+	ErrInvalidWalletReason     = errors.New("invalid wallet reason")
+	ErrInsufficientBalance     = errors.New("insufficient balance")
 )
 
+// 单笔人工调账上限：10 万元，防止误填。
+const maxWalletAdjustAmountCent int64 = 10_000_000
+
 var manualRealnameIDPattern = regexp.MustCompile(`^\d{17}[\dXx]$`)
 
 type Service struct {
@@ -85,6 +92,29 @@ func (s *Service) ManualRealname(ctx context.Context, adminID uint64, userID uin
 	return s.repo.ManualRealname(ctx, adminID, userID, req, meta)
 }
 
+func (s *Service) AdjustWallet(ctx context.Context, adminID uint64, userID uint64, req WalletAdjustRequest, meta AuditMeta) (*UserDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if userID == 0 {
+		return nil, ErrInvalidUser
+	}
+	direction := strings.TrimSpace(strings.ToLower(req.Direction))
+	if direction != "in" && direction != "out" {
+		return nil, ErrInvalidWalletDirection
+	}
+	if req.AmountCent <= 0 || req.AmountCent > maxWalletAdjustAmountCent {
+		return nil, ErrInvalidWalletAmount
+	}
+	if reasonLen := len([]rune(strings.TrimSpace(req.Reason))); reasonLen < 2 || reasonLen > 200 {
+		return nil, ErrInvalidWalletReason
+	}
+	req.Direction = direction
+	req.Reason = strings.TrimSpace(req.Reason)
+	req.ReferenceNo = strings.TrimSpace(req.ReferenceNo)
+	return s.repo.AdjustWallet(ctx, adminID, userID, req, meta)
+}
+
 func validManualRealname(name string, idNo string) bool {
 	name = strings.TrimSpace(name)
 	idNo = strings.TrimSpace(idNo)