feat(#130): add VCS routing in cmd/review-bot via --vcs-type flag

- Add vcs_client.go with vcsClient interface, giteaClientVCSAdapter, githubClientVCSAdapter
- Add giteaExtendedClient interface for Gitea-specific operations (supersede, resolve, etc.)
- Add --vcs-type flag (gitea|github, default: gitea) with VCS_TYPE env var support
- Replace direct giteaClient usage with vcsClient interface in main.go
- Add verdictToVCSEvent() to map LLM verdict to vcs.ReviewEvent
- Gitea adapter translates vcs.ReviewEvent back to Gitea API format (APPROVE->APPROVED)
- Guard Gitea-specific ops (RequestReviewer, supersede, resolve) with type assertion
- Guard fetchPatterns GetAllFilesInPath with Gitea-only type assertion
- Replace reviewClientAdapter (giteaClientAdapter) for review.GiteaClient interface
- Update main_test.go to use reviewInfo/commitStatusInfo instead of gitea types

github/review.go

@@ -90,13 +90,13 @@ func (c *Client) PostReview(ctx context.Context, owner, repo string, number int,
 		c.baseURL, url.PathEscape(owner), url.PathEscape(repo), number)
 
 	payload := postReviewRequest{
-		Body:  req.Body,
-		Event: string(req.Event),
+		Body:     req.Body,
+		Event:    string(req.Event),
+		CommitID: req.CommitID,
 	}
 
-	// Build the payload in one pass. The GitHub API accepts a single commit_id
-	// per review; we extract it from the first comment that supplies one and
-	// reject the request if any other comment disagrees.
+	// Build the comments in one pass. Inline comment CommitIDs must match the
+	// review-level CommitID; reject if any disagree.
 	for _, comment := range req.Comments {
 		if comment.CommitID != "" {
 			if payload.CommitID == "" {