feat: agent state endpoint + search module

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ozonetel/ozonetel-agent.controller.ts

@@ -53,6 +53,29 @@ export class OzonetelAgentController {
         }
     }
 
+    @Post('agent-state')
+    async agentState(
+        @Body() body: { state: 'Ready' | 'Pause'; pauseReason?: string },
+    ) {
+        if (!body.state) {
+            throw new HttpException('state required', 400);
+        }
+
+        this.logger.log(`Agent state change: ${this.defaultAgentId} → ${body.state} (${body.pauseReason ?? ''})`);
+
+        try {
+            const result = await this.ozonetelAgent.changeAgentState({
+                agentId: this.defaultAgentId,
+                state: body.state,
+                pauseReason: body.pauseReason,
+            });
+            return result;
+        } catch (error: any) {
+            const message = error.response?.data?.message ?? error.message ?? 'State change failed';
+            return { status: 'error', message };
+        }
+    }
+
     @Post('agent-ready')
     async agentReady() {
         this.logger.log(`Force ready: logging out and back in agent ${this.defaultAgentId}`);