Add a route to return used tags

This is part of the `/insights` route without queries for file usage.

modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala

@@ -31,11 +31,11 @@ trait Conversions {
       d.incoming,
       d.outgoing,
       d.bytes,
-      TagCloud(d.tags.map(tc => TagCount(mkTagLight(tc), tc.count)))
+      mkTagCloud(d.tags)
     )
 
-  def mkTagLight(t: OCollective.TagCount): TagLight =
-    TagLight(t.id, t.name, t.category)
+  def mkTagCloud(tags: List[OCollective.TagCount]) =
+    TagCloud(tags.map(tc => TagCount(mkTag(tc.tag), tc.count)))
 
   // attachment meta
   def mkAttachmentMeta(rm: RAttachmentMeta): AttachmentMeta =

modules/restserver/src/main/scala/docspell/restserver/routes/CollectiveRoutes.scala

@@ -28,6 +28,12 @@ object CollectiveRoutes {
           resp <- Ok(Conversions.mkItemInsights(ins))
         } yield resp
 
+      case GET -> Root / "cloud" =>
+        for {
+          cloud <- backend.collective.tagCloud(user.account.collective)
+          resp  <- Ok(Conversions.mkTagCloud(cloud))
+        } yield resp
+
       case req @ POST -> Root / "settings" =>
         for {
           settings <- req.as[CollectiveSettings]