Slice 5: Gitea forge - PRs and Merge & clean up

New internal/forge (provider-abstracted, Gitea impl via code.gitea.io/sdk/gitea) with tested remote-URL parsing and read+write ops: list open PRs, and merge-and-cleanup (squash-merge + delete head branch when head/base share a repo). Service resolves repo->owner/repo from remotes (prefers origin) and records a pr-merged event; config gains GITEA_URL/GITEA_TOKEN (forge disabled without both). MCP tools list_prs and merge_and_cleanup_pr (merge tool tells Claude to confirm first, 1.4). HTTP GET /api/repo/prs, POST /api/repo/pr/merge. New <pr-list> component with a confirming Merge & clean up button, hidden when no forge. Verified graceful-disabled path; real merge pending token + a designated PR.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/service/service.go

@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 
 	"gitmanager/internal/activity"
+	"gitmanager/internal/forge"
 	"gitmanager/internal/git"
 	"gitmanager/internal/repos"
 )
@@ -20,12 +21,13 @@ type Service struct {
 	git   *git.CLI
 	index *repos.Index
 	feed  *activity.Feed
+	forge *forge.Gitea // nil when no forge is configured
 }
 
-// New builds a Service over the git boundary, the scanner's repo index, and the
-// activity feed.
-func New(g *git.CLI, index *repos.Index, feed *activity.Feed) *Service {
-	return &Service{git: g, index: index, feed: feed}
+// New builds a Service over the git boundary, the scanner's repo index, the
+// activity feed, and (optionally) a forge provider.
+func New(g *git.CLI, index *repos.Index, feed *activity.Feed, fg *forge.Gitea) *Service {
+	return &Service{git: g, index: index, feed: feed, forge: fg}
 }
 
 // ListRepos returns a snapshot of every discovered repository.
@@ -115,3 +117,75 @@ func (s *Service) AckSwitch(summary string) (activity.PendingSwitch, bool) {
 func (s *Service) CancelSwitch(actor activity.Actor) (activity.PendingSwitch, bool) {
 	return s.feed.CancelSwitch(actor)
 }
+
+// --- Forge (Gitea) — PRs and "Merge & clean up" (§8.4) ---------------------
+
+// ForgeConfigured reports whether any forge provider is set up.
+func (s *Service) ForgeConfigured() bool { return s.forge != nil }
+
+// ForgePRs lists open pull requests for a repo. Returns forge.ErrNotConfigured
+// when no provider is set, or forge.ErrNotSupported when the repo's remote is not
+// on the configured host.
+func (s *Service) ForgePRs(ctx context.Context, repoPath string) ([]forge.PullRequest, error) {
+	owner, repo, err := s.resolveForge(ctx, repoPath)
+	if err != nil {
+		return nil, err
+	}
+	return s.forge.ListPullRequests(ctx, owner, repo)
+}
+
+// MergeAndCleanup merges a PR and deletes its branch, then records the action.
+// The caller is responsible for confirming with the user first (§1.4); actor
+// distinguishes a UI action (user) from an MCP one (claude).
+func (s *Service) MergeAndCleanup(ctx context.Context, actor activity.Actor, repoPath string, number int64) (forge.MergeResult, error) {
+	owner, repo, err := s.resolveForge(ctx, repoPath)
+	if err != nil {
+		return forge.MergeResult{}, err
+	}
+	res, err := s.forge.MergeAndCleanup(ctx, owner, repo, number, forge.MergeSquash)
+	if err != nil {
+		return forge.MergeResult{}, err
+	}
+	detail := fmt.Sprintf("merged PR #%d", res.Number)
+	if res.BranchDeleted && res.Branch != "" {
+		detail += fmt.Sprintf(", deleted branch %s", res.Branch)
+	}
+	s.feed.Record(actor, "pr-merged", filepath.Clean(repoPath), detail)
+	return res, nil
+}
+
+// resolveForge maps a repo path to (owner, repo) on the configured forge host via
+// its git remotes, preferring "origin".
+func (s *Service) resolveForge(ctx context.Context, repoPath string) (owner, repo string, err error) {
+	if s.forge == nil {
+		return "", "", forge.ErrNotConfigured
+	}
+	base, ok := s.index.Get(filepath.Clean(repoPath))
+	if !ok {
+		return "", "", fmt.Errorf("unknown repository %q", repoPath)
+	}
+	remotes, err := s.git.RemoteDetails(ctx, base.Path)
+	if err != nil {
+		return "", "", err
+	}
+	// Prefer origin, then any matching remote.
+	var fallback [2]string
+	haveFallback := false
+	for _, rm := range remotes {
+		host, o, r, ok := forge.ParseRemote(rm.URL)
+		if !ok || !s.forge.Handles(host) {
+			continue
+		}
+		if rm.Name == "origin" {
+			return o, r, nil
+		}
+		if !haveFallback {
+			fallback = [2]string{o, r}
+			haveFallback = true
+		}
+	}
+	if haveFallback {
+		return fallback[0], fallback[1], nil
+	}
+	return "", "", forge.ErrNotSupported
+}