feat: support query public packages without org_id (all orgs)

Make org_id optional in find_public_course_packages API.
When omitted, return all active packages across all orgs.

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

htykc_models/src/models.rs

@@ -875,6 +875,41 @@ impl CoursePackage {
         Ok((items, pages, total))
     }
 
+    pub fn find_all_active_with_page(
+        keyword: &Option<String>,
+        page: i64,
+        page_size: i64,
+        conn: &mut PgConnection,
+    ) -> anyhow::Result<(Vec<CoursePackage>, i64, i64)> {
+        use crate::schema::course_package::dsl::{
+            course_package as packages, is_delete, package_name, package_status,
+            sort_order, created_at,
+        };
+        let total: i64 = packages
+            .filter(package_status.eq("ACTIVE"))
+            .filter(is_delete.is_null().or(is_delete.eq(false)))
+            .count()
+            .get_result(conn)?;
+        let pages = (total + page_size - 1) / page_size;
+        let offset = (page - 1) * page_size;
+        let kws = keyword.clone().unwrap_or_default();
+        let mut query = packages
+            .filter(package_status.eq("ACTIVE"))
+            .filter(is_delete.is_null().or(is_delete.eq(false)))
+            .into_boxed();
+        if !kws.is_empty() {
+            let pattern = format!("%{}%", kws);
+            query = query.filter(package_name.like(pattern));
+        }
+        let items = query
+            .order(sort_order.asc())
+            .then_order_by(created_at.desc())
+            .offset(offset)
+            .limit(page_size)
+            .load::<CoursePackage>(conn)?;
+        Ok((items, pages, total))
+    }
+
     pub fn find_all_by_teacher_id_with_page(
         teacher_id: &String,
         org: &String,