feat(api): internal agent config endpoint (MS22-P1c) (#609)

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

apps/api/src/agent-config/agent-config.controller.ts

@@ -0,0 +1,40 @@
+import {
+  Controller,
+  ForbiddenException,
+  Get,
+  Param,
+  Req,
+  UnauthorizedException,
+  UseGuards,
+} from "@nestjs/common";
+import { AgentConfigService } from "./agent-config.service";
+import { AgentConfigGuard, type AgentConfigRequest } from "./agent-config.guard";
+
+@Controller("internal")
+@UseGuards(AgentConfigGuard)
+export class AgentConfigController {
+  constructor(private readonly agentConfigService: AgentConfigService) {}
+
+  // GET /api/internal/agent-config/:id
+  // Auth: Bearer token (validated against UserContainer.gatewayToken or SystemContainer.gatewayToken)
+  // Returns: assembled openclaw.json
+  //
+  // The :id param is the container record ID (cuid)
+  // Token must match the container requesting its own config
+  @Get("agent-config/:id")
+  async getAgentConfig(
+    @Param("id") id: string,
+    @Req() request: AgentConfigRequest
+  ): Promise<object> {
+    const containerAuth = request.containerAuth;
+    if (!containerAuth) {
+      throw new UnauthorizedException("Missing container authentication context");
+    }
+
+    if (containerAuth.id !== id) {
+      throw new ForbiddenException("Token is not authorized for the requested container");
+    }
+
+    return this.agentConfigService.generateConfigForContainer(containerAuth.type, id);
+  }
+}