feat(points): P2 step 2.3 - wire scripts_ai 3 endpoints points gate

- extract_from_douyin: @points_gate("douyin_extract") 1分/次
- ai_rewrite: @points_gate("ai_rewrite") 1分/次
- ai_generate_titles: @points_gate("ai_title") 1分/次
- All gated by settings.points_enabled (default false)
- Refund on exception handled by decorator
- Renamed authenticated_user → current_user in route + tests for decorator compat
- 4 new points tests; 32+4=36 scripts_ai tests pass; 15472 total passed

apps/api/app/api/routes/scripts_ai.py

@@ -30,6 +30,7 @@ from app.services.script_asr_service import (
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.orm import Session
 
+from app.dependencies import get_db_session
 from packages.middleware.points_gate import points_gate
 from packages.shared.ai_client import get_doubao_client
 

tests/unit/test_scripts_ai.py

@@ -13,6 +13,8 @@ from __future__ import annotations
 import sys
 from unittest.mock import MagicMock, patch
 
+import packages.middleware.points_gate as _pg_module
+
 import pydantic
 import pytest