fix: relink legacy AUDIO questions to audio_conversation_type definition

Co-authored-by: Cursor <cursoragent@cursor.com>

db/migrations/000082_fixup_legacy_audio_question_type_definition.down.sql

@@ -0,0 +1 @@
+-- Data fix is not reversed: legacy AUDIO relinks cannot be restored without a backup.

db/migrations/000082_fixup_legacy_audio_question_type_definition.up.sql

@@ -0,0 +1,46 @@
+-- Legacy AUDIO questions (voice_prompt / sample_answer fields, no dynamic_payload) were linked to
+-- unrelated dynamic definitions (e.g. ielts_speaking_cue_card_part1). Ensure the canonical
+-- audio_conversation_type definition exists and relink affected rows.
+
+INSERT INTO question_type_definitions (
+    key,
+    display_name,
+    description,
+    stimulus_component_kinds,
+    response_component_kinds,
+    stimulus_schema,
+    response_schema,
+    is_system,
+    status
+)
+VALUES (
+    'audio_conversation_type',
+    'Audio Conversation',
+    'Listen to a voice prompt and respond with a spoken answer. Maps to legacy AUDIO questions (voice_prompt, sample_answer_voice_prompt, audio_correct_answer_text).',
+    ARRAY['QUESTION_TEXT', 'AUDIO_PROMPT']::TEXT[],
+    ARRAY['AUDIO_RESPONSE']::TEXT[],
+    '[
+        {"id": "question_text_1", "kind": "QUESTION_TEXT", "label": "Question text", "required": false},
+        {"id": "voice_prompt_1", "kind": "AUDIO_PROMPT", "label": "Voice prompt", "required": true},
+        {"id": "sample_answer_voice_prompt_1", "kind": "AUDIO_PROMPT", "label": "Sample answer voice prompt", "required": false}
+    ]'::jsonb,
+    '[
+        {"id": "audio_response_1", "kind": "AUDIO_RESPONSE", "label": "Learner audio response", "required": true}
+    ]'::jsonb,
+    TRUE,
+    'ACTIVE'
+)
+ON CONFLICT (key) DO NOTHING;
+
+UPDATE questions q
+SET
+    question_type_definition_id = audio_def.id,
+    updated_at = CURRENT_TIMESTAMP
+FROM question_type_definitions audio_def
+WHERE audio_def.key = 'audio_conversation_type'
+  AND q.question_type = 'AUDIO'
+  AND q.dynamic_payload IS NULL
+  AND (
+      q.question_type_definition_id IS NULL
+      OR q.question_type_definition_id IS DISTINCT FROM audio_def.id
+  );