fix(agent): pass sessionId to system prompt for text chat OAuth trigger

Text sessions were not passing sessionId to SystemPromptBuilder, causing
Claude to use the `initiate_dingtalk_binding` custom tool (claude_api only).
When the engine is claude_agent_sdk, this tool does not exist → 404.

Fix: pass session.id as sessionId to systemPromptBuilder.build() in
agent.controller.ts. Claude will now use the wget oauth-trigger endpoint
for ALL session types (text and voice), which works with every engine.

Also: store userId (staffId) as the DingTalk binding ID when resolvable,
falling back to openId. Bot messages deliver senderStaffId which matches
userId, not openId — this prevents the "binding not found" routing failure.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/services/agent-service/src/infrastructure/dingtalk/dingtalk-router.service.ts

@@ -256,11 +256,19 @@ export class DingTalkRouterService implements OnModuleInit, OnModuleDestroy {
 
     const instance = await this.instanceRepo.findById(entry.instanceId);
     if (!instance) throw new Error('智能体实例不存在');
-    // Store openId — this matches senderId in incoming bot messages (used for routing)
+
-    instance.dingTalkUserId = openId;
+    // Store userId (staffId) as the binding identifier if resolved — this matches senderStaffId
+    // in incoming DingTalk bot messages, enabling correct routing.
+    // Fall back to openId if userId could not be resolved (routing may still work if
+    // DingTalk delivers openId in senderId for this app type).
+    const bindingId = userId ?? openId;
+    instance.dingTalkUserId = bindingId;
     await this.instanceRepo.save(instance);
 
-    this.logger.log(`OAuth binding saved: instance ${entry.instanceId} → dingTalkUserId(openId)=${openId}`);
+    this.logger.log(
+      `OAuth binding saved: instance ${entry.instanceId} → dingTalkUserId=${bindingId} ` +
+      `(${userId ? 'staffId/userId' : 'openId fallback — staffId not resolved'})`,
+    );
 
     // Send proactive greeting using userId (staffId). Skip if not resolved.
     this.sendGreeting(userId, openId, instance.name).catch((e: Error) =>

packages/services/agent-service/src/interfaces/rest/controllers/agent.controller.ts

@@ -146,6 +146,10 @@ export class AgentController {
       tenantId,
       userId,
       userEmail,
+      // Pass session ID so Claude uses the wget oauth-trigger endpoint (works for ALL engine types).
+      // The oauth-trigger endpoint emits an oauth_prompt WS event to this session's stream,
+      // which Flutter's chat page handles the same way as voice sessions.
+      sessionId: session.id,
     });
 
     // Fire-and-forget: run the task stream