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/2022-08-21-063222_remove_qumu_section_fields/up.sql

@@ -0,0 +1,17 @@
+-- Your SQL goes here
+
+alter table qumu_section
+    drop column qupu_id;
+
+alter table qumu_section
+    drop column qupu_url;
+
+alter table qumu_section
+    drop column shifan_id;
+
+alter table qumu_section
+    drop column shifan_url;
+
+alter table qumu_section
+    drop column task;
+