feat(#125): rename GITEA_URL to VCS_URL with deprecated fallback

- Add --vcs-url flag as primary (reads VCS_URL env var)
- Keep --gitea-url and GITEA_URL as deprecated fallbacks with warnings
- Update action.yml: rename gitea-url input to vcs-url, pass VCS_URL to binary
- Update ci.yml: use VCS_URL env var in Run review step
- Update integration tests: INTEGRATION_GITEA_URL -> INTEGRATION_VCS_URL
- Update README: --vcs-url / VCS_URL with fallback note in env var table

Backward compat: existing GITEA_URL users get a deprecation warning and
continue to work unchanged until they migrate to VCS_URL.

cmd/review-bot/integration_test.go

@@ -17,7 +17,7 @@ import (
 // Integration test requires a running Gitea instance and LLM endpoint.
 // Set environment variables:
 //
-//	INTEGRATION_GITEA_URL     - Gitea base URL
+//	INTEGRATION_VCS_URL       - VCS base URL
 //	INTEGRATION_GITEA_TOKEN   - Gitea API token with repo access
 //	INTEGRATION_GITEA_REPO    - owner/repo with an open PR
 //	INTEGRATION_PR_NUMBER     - PR number to test against
@@ -25,7 +25,7 @@ import (
 //	INTEGRATION_LLM_API_KEY   - LLM API key
 //	INTEGRATION_LLM_MODEL     - Model name
 func TestIntegration_FullReviewFlow(t *testing.T) {
-	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaURL := os.Getenv("INTEGRATION_VCS_URL")
 	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
 	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
 	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")
@@ -104,7 +104,7 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 }
 
 func TestIntegration_PostAndCleanup(t *testing.T) {
-	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaURL := os.Getenv("INTEGRATION_VCS_URL")
 	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
 	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
 	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")

cmd/review-bot/main.go

@@ -54,7 +54,8 @@ func main() {
 	logFormat := flag.String("log-format", envOrDefault("LOG_FORMAT", "text"), "Log output format: text or json")
 	verbosity := flag.String("verbosity", envOrDefault("LOG_VERBOSITY", "info"), "Log verbosity: debug, info, warn, error")
 	// CLI flags
-	giteaURL := flag.String("gitea-url", envOrDefault("GITEA_URL", ""), "Gitea instance URL")
+	vcsURL := flag.String("vcs-url", os.Getenv("VCS_URL"), "VCS server URL (e.g. https://gitea.example.com)")
+	giteaURLAlias := flag.String("gitea-url", "", "Deprecated: use --vcs-url")
 	repo := flag.String("repo", envOrDefault("GITEA_REPO", ""), "Repository (owner/name)")
 	prNum := flag.String("pr", envOrDefault("PR_NUMBER", ""), "Pull request number")
 	reviewerName := flag.String("reviewer-name", envOrDefault("REVIEWER_NAME", ""), "Reviewer display name")
@@ -91,12 +92,24 @@ func main() {
 
 	slog.Info("review-bot starting", "version", version)
 
+	// Backward compatibility: fall back to deprecated env var / flag if VCS_URL / --vcs-url not set.
+	if *vcsURL == "" {
+		if v := os.Getenv("GITEA_URL"); v != "" {
+			slog.Warn("GITEA_URL is deprecated; rename the environment variable to VCS_URL")
+			*vcsURL = v
+		}
+	}
+	if *vcsURL == "" && *giteaURLAlias != "" {
+		slog.Warn("--gitea-url is deprecated; use --vcs-url instead")
+		*vcsURL = *giteaURLAlias
+	}
+
 	// Validate required fields
 	// For aicore provider, llm-base-url and llm-api-key are not required
 	isAICore := llm.Provider(*llmProvider) == llm.ProviderAICore
-	if *giteaURL == "" || *repo == "" || *prNum == "" || *reviewerToken == "" || *llmModel == "" {
+	if *vcsURL == "" || *repo == "" || *prNum == "" || *reviewerToken == "" || *llmModel == "" {
 		fmt.Fprintf(os.Stderr, "Error: missing required flags or environment variables\n\n")
-		fmt.Fprintf(os.Stderr, "Required: --gitea-url, --repo, --pr, --reviewer-token, --llm-model\n")
+		fmt.Fprintf(os.Stderr, "Required: --vcs-url, --repo, --pr, --reviewer-token, --llm-model\n")
 		os.Exit(1)
 	}
 	if !isAICore && (*llmBaseURL == "" || *llmAPIKey == "") {
@@ -139,7 +152,7 @@ func main() {
 	}
 
 	// Initialize clients
-	giteaClient := gitea.NewClient(*giteaURL, *reviewerToken)
+	giteaClient := gitea.NewClient(*vcsURL, *reviewerToken)
 	llmClient := llm.NewClient(*llmBaseURL, *llmAPIKey, *llmModel)
 	if *llmTemp < 0 || *llmTemp > 2 {
 		slog.Error("invalid LLM temperature", "temperature", *llmTemp, "range", "0-2")
@@ -453,7 +466,7 @@ func main() {
 
 	// Supersede all old reviews with link to the new one
 	if len(oldReviews) > 0 {
-		newReviewURL := fmt.Sprintf("%s/%s/%s/pulls/%d#pullrequestreview-%d", strings.TrimRight(*giteaURL, "/"), owner, repoName, prNumber, posted.ID)
+		newReviewURL := fmt.Sprintf("%s/%s/%s/pulls/%d#pullrequestreview-%d", strings.TrimRight(*vcsURL, "/"), owner, repoName, prNumber, posted.ID)
 		for _, oldReview := range oldReviews {
 			cid, err := giteaClient.GetTimelineReviewCommentIDForReview(ctx, owner, repoName, prNumber, oldReview.ID)
 			if err != nil {