Add notice compatibility routes for other frontends

Fixes: https://git.pleroma.social/pleroma/pleroma/-/issues/1785

test/pleroma/web/o_status/o_status_controller_test.exs

@@ -343,4 +343,54 @@ defmodule Pleroma.Web.OStatus.OStatusControllerTest do
       |> response(200)
     end
   end
+
+  describe "notice compatibility routes" do
+    test "Soapbox FE", %{conn: conn} do
+      user = insert(:user)
+      note_activity = insert(:note_activity, user: user)
+
+      resp =
+        conn
+        |> put_req_header("accept", "text/html")
+        |> get("/@#{user.nickname}/posts/#{note_activity.id}")
+        |> response(200)
+
+      expected =
+        "<meta content=\"#{Pleroma.Web.base_url()}/notice/#{note_activity.id}\" property=\"og:url\">"
+
+      assert resp =~ expected
+    end
+
+    test "Mastodon", %{conn: conn} do
+      user = insert(:user)
+      note_activity = insert(:note_activity, user: user)
+
+      resp =
+        conn
+        |> put_req_header("accept", "text/html")
+        |> get("/@#{user.nickname}/#{note_activity.id}")
+        |> response(200)
+
+      expected =
+        "<meta content=\"#{Pleroma.Web.base_url()}/notice/#{note_activity.id}\" property=\"og:url\">"
+
+      assert resp =~ expected
+    end
+
+    test "Twitter", %{conn: conn} do
+      user = insert(:user)
+      note_activity = insert(:note_activity, user: user)
+
+      resp =
+        conn
+        |> put_req_header("accept", "text/html")
+        |> get("/#{user.nickname}/status/#{note_activity.id}")
+        |> response(200)
+
+      expected =
+        "<meta content=\"#{Pleroma.Web.base_url()}/notice/#{note_activity.id}\" property=\"og:url\">"
+
+      assert resp =~ expected
+    end
+  end
 end

test/pleroma/web/plugs/frontend_static_plug_test.exs

@@ -86,6 +86,8 @@ defmodule Pleroma.Web.Plugs.FrontendStaticPlugTest do
       "objects",
       "activities",
       "notice",
+      "@:nickname",
+      ":nickname",
       "users",
       "tags",
       "mailer",