feat(ci): P2债务清理 + Production部署门禁

feat(ci): P2债务清理 + Production部署门禁

- 升级PyJWT 2.9.0 -> 2.13.0，修复4个CVE
- 清理5处死代码（未使用import和参数）
- Production部署加健康检查门禁（API health + 登录接口 + Web前端）
- deploy-production加checkout，修复通知脚本路径问题

apps/worker/video_processing/unified_render_service.py

@@ -28,7 +28,6 @@ from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any
 
-from video_processing.chroma_key_engine import apply_chroma_key_if_needed
 from video_processing.color_grade_engine import ColorGradeConfig, ColorGradeEngine
 from video_processing.ffmpeg_utils import (
     DEFAULT_FPS,
@@ -46,7 +45,7 @@ from video_processing.render_audio import RenderContext, merge_audio_video, mix_
 from video_processing.render_subtitles import generate_ass_subtitles
 from video_processing.reverse_engine import ReverseConfig, ReverseEngine
 from video_processing.speed_engine import SpeedConfig, SpeedEngine
-from video_processing.sticker_engine import StickerEngine, parse_stickers_from_config
+from video_processing.sticker_engine import StickerEngine
 from video_processing.subtitle_generator import generate_ass_from_timeline
 from video_processing.transition_engine import TransitionEngine
 from video_processing.trim_engine import TrimConfig, TrimEngine, extract_trim_from_clip_config