feat(course-package): add org_visible to course_group and course_package_item table

Migrations:
- htyws: add org_id, org_visible columns to course_group
- htykc: create course_package_item table

Backend:
- CourseGroup: add org_visible, org_id fields; find_org_visible_by_org_id query
- CoursePackageItem: new model with sync/list API
- SUPERVISOR role check for package item management
- New endpoint: GET /api/v1/ws/find_org_visible_course_groups
- New endpoints: POST /api/v1/clazz/course-package/item/sync,
  GET /api/v1/clazz/course-package/item/list/{package_id}

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

htykc_models/migrations/2026-04-30-061901_create_course_package_item/down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS course_package_item;

htykc_models/migrations/2026-04-30-061901_create_course_package_item/up.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS course_package_item (
+    id VARCHAR NOT NULL PRIMARY KEY,
+    package_id VARCHAR NOT NULL,
+    course_group_id VARCHAR NOT NULL,
+    sort_order INT4 DEFAULT 0,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    created_by VARCHAR,
+    is_delete BOOL DEFAULT FALSE
+);
+
+CREATE INDEX IF NOT EXISTS idx_cpi_package_id ON course_package_item (package_id);
+CREATE INDEX IF NOT EXISTS idx_cpi_course_group_id ON course_package_item (course_group_id);
+CREATE INDEX IF NOT EXISTS idx_cpi_package_course_group ON course_package_item (package_id, course_group_id);