refactor teaching domain naming to course/course_section/course_group

Add diesel migrations and synchronize backend/frontend model fields plus jsonb key migration to support generic teaching subjects beyond piano-specific naming. Made-with: Cursor
2026-04-23 17:16:10 +08:00
commit c843fecbce
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+target/
+**/target/
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+.DS_Store
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+.env
+**/.env
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+node_modules/
+**/node_modules/
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+dist/
+coverage/