feat: v3.2 — YouTube Shorts 봇 + 수동 어시스트 + 보안 개선

주요 추가 기능:
- bots/shorts/ 서브모듈 7개: tts_engine, script_extractor, asset_resolver,
  stock_fetcher, caption_renderer, video_assembler, youtube_uploader
- bots/shorts_bot.py: 6단계 Shorts 파이프라인 오케스트레이터
  (auto/semi_auto 두 가지 생산 모드, CLI 지원)
- bots/writer_bot.py: 독립 실행형 AI 글쓰기 봇 (대시보드 연동)
- bots/assist_bot.py: URL 기반 수동 어시스트 파이프라인
- config/shorts_config.json: Shorts 전체 설정
- templates/shorts/extract_prompt.txt: LLM 스크립트 추출 프롬프트
- scheduler.py에 shorts 잡(10:35/16:00) + /shorts Telegram 명령 추가

보안 개선:
- .env 파일 외부 경로 참조로 변경 (load_dotenv dotenv_path, 24개 파일)
- .gitignore에 민감 파일/내부 문서/런타임 데이터 항목 추가

문서:
- README.md 전면 재작성 (상세 한글 설명, 설치/설정/사용법 포함)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/setup.bat

@@ -44,6 +44,27 @@ if not exist data\assist\inbox mkdir data\assist\inbox
 if not exist data\novels mkdir data\novels
 if not exist logs mkdir logs
 if not exist config\novels mkdir config\novels
+if not exist data\shorts mkdir data\shorts
+if not exist data\shorts\scripts mkdir data\shorts\scripts
+if not exist data\shorts\clips mkdir data\shorts\clips
+if not exist data\shorts\tts mkdir data\shorts\tts
+if not exist data\shorts\captions mkdir data\shorts\captions
+if not exist data\shorts\rendered mkdir data\shorts\rendered
+if not exist data\shorts\published mkdir data\shorts\published
+if not exist assets\characters\zero\expressions mkdir assets\characters\zero\expressions
+if not exist assets\characters\zero\poses mkdir assets\characters\zero\poses
+if not exist assets\characters\bao\expressions mkdir assets\characters\bao\expressions
+if not exist assets\characters\bao\poses mkdir assets\characters\bao\poses
+if not exist assets\characters\bao\scarves mkdir assets\characters\bao\scarves
+if not exist assets\backgrounds\fourth_path mkdir assets\backgrounds\fourth_path
+if not exist assets\backgrounds\tech_blog mkdir assets\backgrounds\tech_blog
+if not exist assets\bgm mkdir assets\bgm
+if not exist input\images mkdir input\images
+if not exist input\videos mkdir input\videos
+if not exist input\scripts mkdir input\scripts
+if not exist input\audio mkdir input\audio
+if not exist input\_processed mkdir input\_processed
+if not exist templates\shorts mkdir templates\shorts
 
 REM Download fonts (Noto Sans KR for card/shorts converter)
 echo [INFO] Downloading fonts...