feat: link deposits to bill payment

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

@@ -33,6 +33,9 @@ export class Bill {
   @Column({ name: 'total_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
   totalAmount: number;
 
+  @Column({ name: 'deposit_deducted_amount', type: 'decimal', precision: 10, scale: 2, default: 0 })
+  depositDeductedAmount: number;
+
   @Column({ type: 'varchar', length: 20, default: 'draft' })
   status: string;
 

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

@@ -21,7 +21,7 @@ export class Deposit {
   @Column({ type: 'decimal', precision: 10, scale: 2, default: 500 })
   amount: number;
 
-  // paid: 已缴 | refunded: 已退 | deducted: 已扣除（部分或全部）
+  // paid: 有可用余额 | refunded: 余额已全部退还 | depleted: 余额已被账单扣完
   @Column({ type: 'varchar', length: 20, default: 'paid' })
   status: string;
 
@@ -43,8 +43,8 @@ export class Deposit {
   @Column({ type: 'text', nullable: true })
   notes: string;
 
-  @Column({ name: 'recorded_by', nullable: true })
-  recordedBy: number;
+  @Column({ name: 'recorded_by', type: 'integer', nullable: true })
+  recordedBy: number | null;
 
   @Column({ name: 'refunded_by', type: 'integer', nullable: true })
   refundedBy: number | null;