Fix repo grouping to order by group_header in database query

Previously, repos were paginated first then grouped, causing groups to be
split across pages. Now when grouping is enabled:

1. Order by group_header first in DB query (keeps groups together)
2. Support ?limit=N parameter (max 100) to show more repos per page

Example: /org/repositories?limit=50 shows 50 repos per page

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

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

routers/web/org/home.go

@@ -82,6 +82,17 @@ func home(ctx *context.Context, viewRepositories bool) {
 		page = 1
 	}
 
+	// Allow custom page size via limit parameter (max 100, default from settings)
+	pageSize := ctx.FormInt("limit")
+	if pageSize <= 0 || pageSize > 100 {
+		pageSize = setting.UI.User.RepoPagingNum
+	}
+	ctx.Data["PageSize"] = pageSize
+
+	// Check if grouping is enabled (default: true)
+	showGrouping := ctx.FormString("show_groups") != "0"
+	ctx.Data["ShowGrouping"] = showGrouping
+
 	archived := ctx.FormOptionalBool("archived")
 	ctx.Data["IsArchived"] = archived
 
@@ -221,14 +232,20 @@ func home(ctx *context.Context, viewRepositories bool) {
 	ctx.Data["PageIsViewOverview"] = isViewOverview
 	ctx.Data["ShowOrgProfileReadmeSelector"] = isViewOverview && prepareResult.ProfilePublicReadmeBlob != nil && prepareResult.ProfilePrivateReadmeBlob != nil
 
+	// When grouping is enabled, order by group_header first to keep groups together
+	finalOrderBy := orderBy
+	if showGrouping {
+		finalOrderBy = db.SearchOrderBy("group_header ASC, " + string(orderBy))
+	}
+
 	repos, count, err := repo_model.SearchRepository(ctx, repo_model.SearchRepoOptions{
 		ListOptions: db.ListOptions{
-			PageSize: setting.UI.User.RepoPagingNum,
+			PageSize: pageSize,
 			Page:     page,
 		},
 		Keyword:            keyword,
 		OwnerID:            org.ID,
-		OrderBy:            orderBy,
+		OrderBy:            finalOrderBy,
 		Private:            ctx.IsSigned,
 		Actor:              ctx.Doer,
 		Language:           language,
@@ -248,9 +265,6 @@ func home(ctx *context.Context, viewRepositories bool) {
 	ctx.Data["Total"] = count
 
 	// Group repos by GroupHeader for grouped view
-	showGrouping := ctx.FormString("show_groups") != "0" // default to true
-	ctx.Data["ShowGrouping"] = showGrouping
-
 	if showGrouping {
 		groupedRepos := make(map[string][]*repo_model.Repository)
 		var headers []string
@@ -280,7 +294,7 @@ func home(ctx *context.Context, viewRepositories bool) {
 		ctx.Data["RepoHeaders"] = headers
 	}
 
-	pager := context.NewPagination(int(count), setting.UI.User.RepoPagingNum, page, 5)
+	pager := context.NewPagination(int(count), pageSize, page, 5)
 	pager.AddParamFromRequest(ctx.Req)
 	ctx.Data["Page"] = pager