fix(agent): hoist structured output defs to tool root

Author: Alexxigang

agentscope-core/src/main/java/io/agentscope/core/agent/StructuredOutputCapableAgent.java

@@ -342,4 +342,4 @@ private Msg mergeCollectedMetadata(Msg msg, ChatUsage chatUsage, ThinkingBlock t
                 .timestamp(msg.getTimestamp())
                 .build();
     }
-}
+}

agentscope-core/src/main/java/io/agentscope/core/tool/ToolSchemaGenerator.java

@@ -138,4 +138,4 @@ private static class ParameterInfo {
             this.required = required;
         }
     }
-}
+}

agentscope-core/src/main/java/io/agentscope/core/util/JsonSchemaUtils.java

@@ -162,4 +162,4 @@ public static <T> T convertToObject(Object data, Class<T> targetClass) {
             throw new RuntimeException("Failed to convert metadata to " + targetClass.getName(), e);
         }
     }
-}
+}

agentscope-core/src/test/java/io/agentscope/core/agent/StructuredOutputDynamicDefineTest.java

@@ -241,4 +241,4 @@ private static MockModel getMockModel() {
                         });
         return mockModel;
     }
-}
+}

agentscope-core/src/test/java/io/agentscope/core/util/JsonSchemaUtilsTest.java

@@ -156,4 +156,4 @@ void testGenerateSchemaFromType() {
         assertNotNull(mapSchema);
         assertEquals("object", mapSchema.get("type"));
     }
-}
+}