feat: add teacher_id filter to student daka query

Allow students to filter dakas by teacher_id when querying.
Both student_id and teacher_id can now coexist in the request.

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

htyws/src/ws_daka.rs

@@ -831,8 +831,9 @@ pub async fn raw_find_dakas_with_sections_by_user_id(
     debug!("raw_find_dakas_with_sections_by_user_id -> teacher_id: {:?} / student_id: {:?} / scope: {:?}", teacher_id, student_id, scope);
     let current_org_id = required_current_org_id_from_sudoer_token_str(&_root.0)?;
 
-    if (teacher_id.is_some() && student_id.is_some())
-        || (teacher_id.is_none() && student_id.is_none())
+    // student_id and teacher_id can coexist (student filtering by teacher)
+    // but at least one must be present
+    if teacher_id.is_none() && student_id.is_none()
     {
         return Err(anyhow!(HtyErr {
             code: HtyErrCode::WebErr,
@@ -898,7 +899,7 @@ pub async fn raw_find_dakas_with_sections_by_user_id(
 
         dakas = dakas_with_pages.0;
     } else {
-        // student_id
+        // student_id (with optional teacher_id filter)
         let id_student = student_id
             .as_ref()
             .ok_or_else(|| anyhow!("student_id is required"))?;
@@ -908,6 +909,7 @@ pub async fn raw_find_dakas_with_sections_by_user_id(
             &current_org_id,
             page,
             page_size,
+            *teacher_id,
             extract_conn(fetch_db_conn(&db_pool)?).deref_mut(),
         )?;
         dakas = dakas_with_pages.0;