feat: add recharge create and status APIs

apps/api/serializers.py

@@ -1,5 +1,9 @@
+from decimal import Decimal
+
 from rest_framework import serializers
 
+from apps.billing.models import RechargeOrder
+
 
 class GenerateTitleRequestSerializer(serializers.Serializer):
     prompt = serializers.CharField(trim_whitespace=True, allow_blank=False)
@@ -43,3 +47,20 @@ class GenerateImageRequestSerializer(serializers.Serializer):
         default="1:1",
     )
     parameters = serializers.DictField(required=False, default=dict)
+
+
+class RechargeCreateRequestSerializer(serializers.Serializer):
+    amount = serializers.DecimalField(
+        max_digits=12,
+        decimal_places=2,
+        min_value=Decimal("0.01"),
+    )
+    pay_method = serializers.ChoiceField(choices=RechargeOrder.PayMethod.values)
+
+
+class RechargeStatusRequestSerializer(serializers.Serializer):
+    order_no = serializers.CharField(
+        trim_whitespace=True,
+        allow_blank=False,
+        max_length=64,
+    )