feat: tags UI (wip) + save tags from page

server/graph/schemas/page.graphql

@@ -36,6 +36,8 @@ type PageQuery {
   single(
     id: Int!
   ): Page @auth(requires: ["manage:pages", "delete:pages", "manage:system"])
+
+  tags: [PageTag]! @auth(requires: ["manage:system", "read:pages"])
 }
 
 # -----------------------------------------------
@@ -109,6 +111,7 @@ type Page {
   privateNS: String
   publishStartDate: Date!
   publishEndDate: String!
+  tags: [PageTag]!
   content: String!
   render: String
   toc: String
@@ -125,6 +128,14 @@ type Page {
   creatorEmail: String!
 }
 
+type PageTag {
+  id: Int!
+  tag: String!
+  title: String
+  createdAt: Date!
+  updatedAt: Date!
+}
+
 type PageHistory {
   versionId: Int!
   authorId: Int!