✨ feat(server): add batchMoveTopics TRPC mutation

Expose TopicModel.batchMoveToAgent through a new topic.batchMoveTopics
lambda mutation (topic:update scoped permission, input { topicIds,
targetAgentId }) and add the matching topicService.batchMoveTopics client
wrapper.

Depends on the database layer (TopicModel.batchMoveToAgent).
Part of LOBE-10330

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/routers/lambda/topic.ts

@@ -162,6 +162,18 @@ export const topicRouter = router({
       return ctx.topicModel.batchDeleteBySessionId(resolved.sessionId);
     }),
 
+  batchMoveTopics: topicProcedure
+    .use(withScopedPermission('topic:update'))
+    .input(
+      z.object({
+        targetAgentId: z.string(),
+        topicIds: z.array(z.string()),
+      }),
+    )
+    .mutation(async ({ input, ctx }) => {
+      return ctx.topicModel.batchMoveToAgent(input.topicIds, input.targetAgentId);
+    }),
+
   cloneTopic: topicProcedure
     .use(withScopedPermission('topic:create'))
     .input(z.object({ id: z.string(), newTitle: z.string().optional() }))

src/services/topic/index.ts

@@ -32,6 +32,10 @@ export class TopicService {
     return lambdaClient.topic.cloneTopic.mutate({ id, newTitle });
   };
 
+  batchMoveTopics = (topicIds: string[], targetAgentId: string) => {
+    return lambdaClient.topic.batchMoveTopics.mutate({ targetAgentId, topicIds });
+  };
+
   importTopic = (params: {
     agentId: string;
     data: string;