fix(server): 押金 decimal 列补 transformer，接口金额返回数字

apps/server/src/entities/deposit-installment.entity.ts

@@ -16,7 +16,12 @@ export class DepositInstallment {
   @Column({ name: 'deposit_id' })
   depositId: number;
 
-  @Column({ type: 'decimal', precision: 10, scale: 2 })
+  @Column({
+    type: 'decimal',
+    precision: 10,
+    scale: 2,
+    transformer: { to: (v: number) => v, from: (v: string | null) => (v == null ? v : Number(v)) },
+  })
   amount: number;
 
   @Column({ name: 'due_date', type: 'date' })

apps/server/src/entities/deposit.entity.ts

@@ -18,7 +18,13 @@ export class Deposit {
   @Column({ name: 'student_id' })
   studentId: number;
 
-  @Column({ type: 'decimal', precision: 10, scale: 2, default: 500 })
+  @Column({
+    type: 'decimal',
+    precision: 10,
+    scale: 2,
+    default: 500,
+    transformer: { to: (v: number) => v, from: (v: string | null) => (v == null ? v : Number(v)) },
+  })
   amount: number;
 
   // paid: 有可用余额 | refunded: 余额已全部退还 | depleted: 余额已被账单扣完
@@ -31,10 +37,24 @@ export class Deposit {
   @Column({ name: 'refund_date', type: 'date', nullable: true })
   refundDate: string | null;
 
-  @Column({ name: 'refund_amount', type: 'decimal', precision: 10, scale: 2, nullable: true })
+  @Column({
+    name: 'refund_amount',
+    type: 'decimal',
+    precision: 10,
+    scale: 2,
+    nullable: true,
+    transformer: { to: (v: number | null) => v, from: (v: string | null) => (v == null ? v : Number(v)) },
+  })
   refundAmount: number | null;
 
-  @Column({ name: 'deduction_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
+  @Column({
+    name: 'deduction_amount',
+    type: 'decimal',
+    precision: 10,
+    scale: 2,
+    default: 0,
+    transformer: { to: (v: number) => v, from: (v: string | null) => (v == null ? v : Number(v)) },
+  })
   deductionAmount: number;
 
   @Column({ name: 'deduction_reason', type: 'text', nullable: true })