chore add core rust project files and diesel migrations

Track required workspace crates, scripts, and historical diesel migrations so the repository contains the complete runnable backend baseline.

Made-with: Cursor

htyws_models/migrations/2021-12-30-113916_refactor_qumu/up.sql

@@ -0,0 +1,10 @@
+-- Your SQL goes here
+
+alter table qumu
+    add created_by varchar not null;
+
+alter table qumu
+    add created_at timestamp not null;
+
+drop index qumu_name_uindex;
+