refactor: isolate forward payload serialization

android/app/src/test/java/com/hyzq/boss/ForwardTargetActivityTest.java

@@ -28,7 +28,10 @@ public class ForwardTargetActivityTest {
 
         assertEquals("single", payload.optString("mode"));
         assertEquals("m1", payload.optString("sourceMessageId"));
-        assertEquals("{\"mode\":\"single\",\"sourceMessageId\":\"m1\"}", payload.toString());
+        assertEquals(
+                "{\"targetProjectId\":\"target\",\"mode\":\"single\",\"sourceMessageId\":\"m1\"}",
+                ForwardPayloads.toRequestBody("target", payload)
+        );
     }
 
     @Test
@@ -39,7 +42,16 @@ public class ForwardTargetActivityTest {
         assertEquals(2, payload.optJSONArray("sourceMessageIds").length());
         assertEquals("m1", payload.optJSONArray("sourceMessageIds").optString(0));
         assertEquals("m2", payload.optJSONArray("sourceMessageIds").optString(1));
-        assertEquals("{\"mode\":\"bundle\",\"sourceMessageIds\":[\"m1\",\"m2\"]}", payload.toString());
+        assertEquals(
+                "{\"targetProjectId\":\"target\",\"mode\":\"bundle\",\"sourceMessageIds\":[\"m1\",\"m2\"]}",
+                ForwardPayloads.toRequestBody("target", payload)
+        );
+    }
+
+    @Test
+    public void approvalRequiredResponseUsesApprovalMessage() {
+        StubJSONObject response = new StubJSONObject().withBoolean("approvalRequired", true);
+        assertEquals("已提交主 Agent 审批", ForwardTargetActivity.resolveForwardResultMessage(response));
     }
 
     private static final class StubJSONObject extends JSONObject {
@@ -50,6 +62,11 @@ public class ForwardTargetActivityTest {
             return this;
         }
 
+        StubJSONObject withBoolean(String key, boolean value) {
+            values.put(key, value);
+            return this;
+        }
+
         @Override
         public String optString(String key) {
             Object value = values.get(key);
@@ -61,6 +78,12 @@ public class ForwardTargetActivityTest {
             Object value = values.get(key);
             return value instanceof String ? (String) value : fallback;
         }
+
+        @Override
+        public boolean optBoolean(String key, boolean fallback) {
+            Object value = values.get(key);
+            return value instanceof Boolean ? (Boolean) value : fallback;
+        }
     }
 
     private static final class StubJSONArray extends JSONArray {