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

internal/provider/gitea/comments.go

@@ -0,0 +1,17 @@
+package gitea
+
+import (
+	sdk "code.gitea.io/sdk/gitea"
+)
+
+func (c *Client) PostComment(owner, repo string, issueOrPR int, body string) error {
+	_, _, err := c.api.CreateIssueComment(owner, repo, int64(issueOrPR), sdk.CreateIssueCommentOption{
+		Body: body,
+	})
+	return err
+}
+
+func (c *Client) AddReaction(owner, repo string, commentID int64, reaction string) error {
+	_, _, err := c.api.PostIssueCommentReaction(owner, repo, commentID, reaction)
+	return err
+}