feat: add K8s API server, orchestrator abstraction, and CI pipeline

- Add apps/api/ — Hono REST API server for managing pentest scans via K8s Jobs
  - POST/GET /api/scans, GET /api/scans/:id, cancel, report endpoints
  - Bearer token auth, Temporal client integration, K8s Job builder
  - Dockerfile, Kustomize manifests (Deployment, Service, RBAC)
- Add CLI orchestrator abstraction (docker.ts → Orchestrator interface)
  - DockerOrchestrator and K8sOrchestrator implementations
  - Backend detection via SHANNON_BACKEND env var or --backend flag
- Add CI workflow: type-check + lint on PR, build+push both images on main
- Switch all workflows to self-hosted runners (runners-farhoodliquor)
- Add shannon-api image build to release and release-beta workflows
- Add root infra/kustomization.yaml as Flux entry point
- Export PipelineProgress from @shannon/worker/pipeline

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

apps/worker/src/temporal/pipeline.ts

@@ -5,13 +5,14 @@
  * within their own workflow context.
  */
 
-export { pentestPipeline } from './workflows.js';
+export type { ActivityInput } from './activities.js';
 export type {
   AgentMetrics,
   PipelineInput,
+  PipelineProgress,
   PipelineState,
   PipelineSummary,
   ResumeState,
   VulnExploitPipelineResult,
 } from './shared.js';
-export type { ActivityInput } from './activities.js';
+export { pentestPipeline } from './workflows.js';