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/2022-08-07-144322_add_kecheng_teacher/up.sql

@@ -0,0 +1,20 @@
+-- Your SQL goes here
+
+create table kecheng_teacher
+(
+    id             varchar   not null,
+    teacher_id     varchar   not null,
+    kecheng_name   varchar   not null,
+    kecheng_status varchar   not null,
+    kecheng_desc   varchar,
+    start_from     timestamp not null,
+    end_by         timestamp not null
+);
+
+create unique index kecheng_teacher_id_uindex
+    on kecheng_teacher (id);
+
+alter table kecheng_teacher
+    add constraint kecheng_teacher_pk
+        primary key (id);
+