fix: restore promote.dspy完整表单验证JSON解析

wwwroot/promote.dspy

@@ -1 +1,18 @@
-return {"widgettype": "Form", "options": {"url": "/discount/generate_qr.dspy", "fields": [{"name": "discount", "uitype": "float", "label": "折扣"}]}}
+# Customer promote page - scan QR code to claim discount
+code = params_kw.get('code', '')
+
+result = {
+    "widgettype": "Form",
+    "options": {
+        "width": "100%",
+        "height": "100%",
+        "url": "/discount/generate_qr.dspy?code=" + code,
+        "method": "POST",
+        "fields": [
+            {"name": "valid_term", "label": "有效期", "uitype": "str", "tip": "格式：xY, xM, xD"},
+            {"name": "expired_date", "label": "促销失效日期", "uitype": "date", "tip": "需在此日期前使用"},
+            {"name": "discount", "label": "折扣", "uitype": "float", "tip": "0<折扣<1"}
+        ]
+    },
+    "binds": [{"wid": "self", "event": "submited", "actiontype": "script", "target": "self", "script": "await bricks.show_resp_message_or_error(event.params)"}]
+}