feat(orchestrator): MS23-P0-004 operator inject/pause/resume endpoints (#712)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/orchestrator/src/api/agents/dto/control-agent.dto.ts

@@ -0,0 +1,3 @@
+export class PauseAgentDto {}
+
+export class ResumeAgentDto {}

apps/orchestrator/src/api/agents/dto/inject-agent.dto.ts

@@ -0,0 +1,7 @@
+import { IsNotEmpty, IsString } from "class-validator";
+
+export class InjectAgentDto {
+  @IsString()
+  @IsNotEmpty()
+  message!: string;
+}