fix(org-wiki): also rewrite absolute-form intra-wiki links

Match an optional https://host prefix so wiki links rendered as absolute
URLs (not just root-relative) are rewritten to the /-/wiki/ route too.
Covers nested pages like standards/Wiki-Structure.

Claude-Session: https://claude.ai/code/session_01Bqe7fAuHQeiLueYfeHFrHw

routers/web/org/wiki.go

@@ -156,7 +156,7 @@ func Wiki(ctx *context.Context) {
 // wiki viewer instead of the repo file browser.
 func rewriteOrgWikiLinks(html htmltemplate.HTML, wikiRepo *repo_model.Repository, wikiBase string) htmltemplate.HTML {
 	prefix := wikiRepo.Link() + "/src/branch/" + util.PathEscapeSegments(wikiRepo.DefaultBranch) + "/"
-	re := regexp.MustCompile(`href="` + regexp.QuoteMeta(prefix) + `([^"#?]*)([^"]*)"`)
+	re := regexp.MustCompile(`href="(?:https?://[^/"]+)?` + regexp.QuoteMeta(prefix) + `([^"#?]*)([^"]*)"`)
 	out := re.ReplaceAllStringFunc(string(html), func(m string) string {
 		sm := re.FindStringSubmatch(m)
 		return `href="` + wikiBase + strings.TrimSuffix(sm[1], ".md") + sm[2] + `"`