Initial scaffold: API service, K8s operator, and CRDs

Forgebot is a K8s operator + API service for dispatching AI agent
jobs from git forge commands. Includes:

- CRDs: AgentPool, AgentTask, ProviderQueue, RepositoryBinding
- API server with webhook handler, task queue, and comment proxy
- Operator controllers for task scheduling and job management
- Gitea provider with webhook parsing and signature verification
- PostgreSQL database with auto-migration
- Woodpecker CI pipelines and multi-stage Dockerfiles

api/v1alpha1/doc.go

@@ -0,0 +1,4 @@
+// Package v1alpha1 contains API Schema definitions for forgebot v1alpha1 API group.
+// +kubebuilder:object:generate=true
+// +groupName=forgebot.unkin.net
+package v1alpha1