feat: add MCP support (#20716)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/fields/app_fields.py

@@ -1,8 +1,21 @@
+import json
+
 from flask_restful import fields
 
 from fields.workflow_fields import workflow_partial_fields
 from libs.helper import AppIconUrlField, TimestampField
 
+
+class JsonStringField(fields.Raw):
+    def format(self, value):
+        if isinstance(value, str):
+            try:
+                return json.loads(value)
+            except (json.JSONDecodeError, TypeError):
+                return value
+        return value
+
+
 app_detail_kernel_fields = {
     "id": fields.String,
     "name": fields.String,
@@ -218,3 +231,14 @@ app_import_fields = {
 app_import_check_dependencies_fields = {
     "leaked_dependencies": fields.List(fields.Nested(leaked_dependency_fields)),
 }
+
+app_server_fields = {
+    "id": fields.String,
+    "name": fields.String,
+    "server_code": fields.String,
+    "description": fields.String,
+    "status": fields.String,
+    "parameters": JsonStringField,
+    "created_at": TimestampField,
+    "updated_at": TimestampField,
+}