Never use /api/v1 from Gitea UI Pages (#19318)

Reusing `/api/v1` from Gitea UI Pages have pros and cons.
Pros:
1) Less code copy

Cons:
1) API/v1 have to support shared session with page requests.
2) You need to consider for each other when you want to change something about api/v1 or page.

This PR moves all dependencies to API/v1 from UI Pages.

Partially replace #16052

routers/api/v1/utils/page.go

@@ -0,0 +1,19 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package utils
+
+import (
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/convert"
+)
+
+// GetListOptions returns list options using the page and limit parameters
+func GetListOptions(ctx *context.APIContext) db.ListOptions {
+	return db.ListOptions{
+		Page:     ctx.FormInt("page"),
+		PageSize: convert.ToCorrectPageSize(ctx.FormInt("limit")),
+	}
+}