feat: add TenantLedger model and query generation

- Introduced TenantLedger model with fields for managing tenant transactions, including ID, TenantID, UserID, OrderID, transaction Type, Amount, and balance details.
- Implemented CRUD operations for TenantLedger with methods for Create, Update, Delete, and Reload.
- Generated query methods for TenantLedger to facilitate database interactions, including filtering, pagination, and aggregation functions.
- Established relationships with Order model for foreign key references.

backend/tests/tenant.http

@@ -33,6 +33,25 @@ GET {{ host }}/t/{{ tenantCode }}/v1/contents/{{ contentID }}/assets
 Content-Type: application/json
 Authorization: Bearer {{ token }}
 
+### Tenant - Purchase content (tenant balance)
+POST {{ host }}/t/{{ tenantCode }}/v1/contents/{{ contentID }}/purchase
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
+{
+  "idempotency_key": "purchase-{{ contentID }}-001"
+}
+
+### Tenant - My orders list
+GET {{ host }}/t/{{ tenantCode }}/v1/orders?page=1&limit=10
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
+### Tenant - My order detail
+GET {{ host }}/t/{{ tenantCode }}/v1/orders/{{ orderID }}
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
 ### Tenant Admin - Create content draft
 POST {{ host }}/t/{{ tenantCode }}/v1/admin/contents
 Content-Type: application/json
@@ -79,3 +98,24 @@ Authorization: Bearer {{ token }}
   "sort": 0
 }
 
+### Tenant Admin - Orders list
+GET {{ host }}/t/{{ tenantCode }}/v1/admin/orders?page=1&limit=10
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
+### Tenant Admin - Order detail
+@orderID = 1
+GET {{ host }}/t/{{ tenantCode }}/v1/admin/orders/{{ orderID }}
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
+### Tenant Admin - Refund order (default window paid_at + 24h)
+POST {{ host }}/t/{{ tenantCode }}/v1/admin/orders/{{ orderID }}/refund
+Content-Type: application/json
+Authorization: Bearer {{ token }}
+
+{
+  "force": false,
+  "reason": "联调退款",
+  "idempotency_key": "refund-{{ orderID }}-001"
+}