fix: resolve build errors in v2 API and wiki service

- Fix wiki_index.go: use WebPathToGitPath/GitPathToWebPath instead of undefined functions
- Fix wiki_index.go: use gitrepo.OpenRepository pattern instead of repo.WikiPath()
- Fix wiki.go: use markdown.Render instead of undefined RenderWiki
- Fix wiki.go: use charset.ToUTF8WithFallbackReader instead of undefined ToUTF8Reader
- Fix wiki.go: use gitrepo.CommitsCount instead of undefined wikiRepo.CommitsCount
- Fix wiki.go: handle WebPathToUserTitle returning two values
- Fix gofmt formatting issues in v2 API files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

routers/api/v2/wiki.go

@@ -114,9 +114,10 @@ func ListWikiPagesV2(ctx *context.APIContext) {
 		// Get last commit for this page
 		lastCommit, _ := wikiRepo.GetCommitByPath(entry.Name())
 
+		_, pageTitle := wiki_service.WebPathToUserTitle(wikiName)
 		page := &api.WikiPageV2{
 			Name:    string(wikiName),
-			Title:   wiki_service.WebPathToUserTitle(wikiName),
+			Title:   pageTitle,
 			Path:    entry.Name(),
 			URL:     setting.AppURL + repo.FullName() + "/wiki/" + string(wikiName),
 			HTMLURL: setting.AppURL + repo.FullName() + "/wiki/" + string(wikiName),
@@ -205,13 +206,12 @@ func GetWikiPageV2(ctx *context.APIContext) {
 
 	// Render HTML
 	var htmlContent string
-	if rd, err := charset.ToUTF8Reader(nil, strings.NewReader(content)); err == nil {
+	rd := charset.ToUTF8WithFallbackReader(strings.NewReader(content), charset.ConvertOpts{})
 	if buf := new(strings.Builder); buf != nil {
-			if err := markdown.RenderWiki(ctx, markup.NewRenderContext(ctx).WithRelativePath(gitFilename), rd, buf); err == nil {
+		if err := markdown.Render(markup.NewRenderContext(ctx).WithRelativePath(gitFilename), rd, buf); err == nil {
 			htmlContent = buf.String()
 		}
 	}
-	}
 
 	// Get last commit
 	lastCommit, _ := wikiRepo.GetCommitByPath(gitFilename)
@@ -236,9 +236,10 @@ func GetWikiPageV2(ctx *context.APIContext) {
 		linksIn = incoming
 	}
 
+	_, pageTitle := wiki_service.WebPathToUserTitle(wikiName)
 	page := &api.WikiPageV2{
 		Name:        string(wikiName),
-		Title:       wiki_service.WebPathToUserTitle(wikiName),
+		Title:       pageTitle,
 		Path:        gitFilename,
 		URL:         setting.AppURL + "api/v2/repos/" + repo.FullName() + "/wiki/pages/" + string(wikiName),
 		HTMLURL:     setting.AppURL + repo.FullName() + "/wiki/" + string(wikiName),
@@ -707,8 +708,8 @@ func GetWikiStatsV2(ctx *context.APIContext) {
 	if err == nil && wikiRepo != nil {
 		defer wikiRepo.Close()
 		// Get commit count
-		if count, err := wikiRepo.CommitsCount(&git.CommitsCountOptions{
-			Branch: repo.DefaultWikiBranch,
+		if count, err := gitrepo.CommitsCount(ctx, repo.WikiStorageRepo(), gitrepo.CommitsCountOptions{
+			Revision: []string{repo.DefaultWikiBranch},
 		}); err == nil {
 			totalCommits = count
 		}

services/wiki/wiki_index.go

@@ -13,6 +13,7 @@ import (
 
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/gitrepo"
 	"code.gitea.io/gitea/modules/log"
 )
 
@@ -30,7 +31,7 @@ func IndexWikiPage(ctx context.Context, repo *repo_model.Repository, pageName st
 	}
 
 	// Get the page content
-	pagePath := NameToFilename(pageName)
+	pagePath := WebPathToGitPath(WebPath(pageName))
 	entry, err := commit.GetTreeEntryByPath(pagePath)
 	if err != nil {
 		return err
@@ -110,7 +111,11 @@ func IndexAllWikiPages(ctx context.Context, repo *repo_model.Repository) error {
 			continue
 		}
 
-		pageName := FilenameToName(entry.Name())
+		webPath, err := GitPathToWebPath(entry.Name())
+		if err != nil {
+			continue
+		}
+		pageName := string(webPath)
 		if pageName == "" {
 			continue
 		}
@@ -278,14 +283,11 @@ func GetDeadLinks(ctx context.Context, repoID int64) ([]map[string]string, error
 
 // findWikiRepoCommit opens the wiki repo and gets the latest commit
 func findWikiRepoCommit(ctx context.Context, repo *repo_model.Repository) (*git.Repository, *git.Commit, error) {
-	wikiPath := repo.WikiPath()
-
-	if !git.IsRepoURLAccessible(ctx, wikiPath) {
+	wikiRepo, err := gitrepo.OpenRepository(ctx, repo.WikiStorageRepo())
+	if err != nil {
+		if git.IsErrNotExist(err) {
 			return nil, nil, nil
 		}
-
-	wikiRepo, err := git.OpenRepository(ctx, wikiPath)
-	if err != nil {
 		return nil, nil, err
 	}
 
@@ -297,6 +299,9 @@ func findWikiRepoCommit(ctx context.Context, repo *repo_model.Repository) (*git.
 	commit, err := wikiRepo.GetBranchCommit(branch)
 	if err != nil {
 		wikiRepo.Close()
+		if git.IsErrNotExist(err) {
+			return nil, nil, nil
+		}
 		return nil, nil, err
 	}