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/2022-09-25-161509_add_kecheng_repeat/up.sql

@@ -0,0 +1,22 @@
+-- Your SQL goes here
+create table kecheng_repeat
+(
+    id              varchar not null
+        primary key
+        unique,
+    kecheng_root_id varchar not null,
+    kecheng_id      varchar not null,
+    kecheng_type    varchar,
+    start_from      timestamp,
+    end_by          timestamp,
+    repeat_start    timestamp
+);
+
+comment on column kecheng_repeat.kecheng_type is 'STUDENT或者TEACHER';
+
+comment on column kecheng_repeat.start_from is '课程当天开始时间';
+
+comment on column kecheng_repeat.end_by is '课程的当天结束时间';
+
+comment on column kecheng_repeat.repeat_start is '不需要`repeat_end`了，因为同一组`kecheng_root_id`的数据按照`repeat_start`时间排列，后一个就是前一个的end时间。';
+