fix(db): repair legacy h5_intent_drafts stub schema on migrate

Drop tables created with intent_kind instead of layer/draft_type so ITL draft
inserts succeed after one-off migrate scripts.

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

db.mjs

@@ -1138,6 +1138,35 @@ export async function migrateSchema(pool) {
       CONSTRAINT fk_h5_user_feedback_user FOREIGN KEY (user_id) REFERENCES h5_users(id) ON DELETE CASCADE
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
   `);
+
+  // One-off migrate stub used intent_kind; ITL expects layer/draft_type/action_level/title.
+  if (await tableExists(pool, 'h5_intent_drafts') && !(await columnExists(pool, 'h5_intent_drafts', 'layer'))) {
+    await pool.query('DROP TABLE h5_intent_drafts');
+  }
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS h5_intent_drafts (
+      id CHAR(36) PRIMARY KEY,
+      user_id CHAR(36) NOT NULL,
+      layer ENUM('L0', 'L1', 'L2', 'L3', 'ambiguous') NOT NULL,
+      draft_type VARCHAR(64) NOT NULL,
+      action_level TINYINT UNSIGNED NOT NULL DEFAULT 1,
+      title VARCHAR(255) NOT NULL,
+      payload_json JSON NOT NULL,
+      card_text TEXT NOT NULL,
+      status ENUM('draft', 'confirmed', 'committed', 'cancelled', 'expired') NOT NULL DEFAULT 'draft',
+      source_channel VARCHAR(32) NOT NULL DEFAULT 'wechat',
+      source_message_id VARCHAR(128) NULL,
+      source_text TEXT NULL,
+      committed_ref_json JSON NULL,
+      event_log_json JSON NULL,
+      expires_at BIGINT NULL,
+      created_at BIGINT NOT NULL,
+      updated_at BIGINT NOT NULL,
+      KEY idx_intent_draft_user_status (user_id, status, created_at),
+      KEY idx_intent_draft_expires (status, expires_at),
+      CONSTRAINT fk_intent_draft_user FOREIGN KEY (user_id) REFERENCES h5_users(id) ON DELETE CASCADE
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+  `);
 }
 
 export async function initSchema(pool) {