feat: 웹사이트 표준화 검사 도구 구현

- 4개 검사 엔진: HTML/CSS, 접근성(WCAG), SEO, 성능/보안 (총 50개 항목)
- FastAPI 백엔드 (9개 API, SSE 실시간 진행, PDF/JSON 리포트)
- Next.js 15 프론트엔드 (6개 페이지, 29개 컴포넌트, 반원 게이지 차트)
- Docker Compose 배포 (Backend:8011, Frontend:3011, MongoDB:27022, Redis:6392)
- 전체 테스트 32/32 PASS

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

backend/Dockerfile

@@ -1,8 +1,26 @@
-FROM python:3.11-slim
+FROM python:3.11-slim-bookworm
+
 WORKDIR /app
-RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+# Python dependencies first (for better caching)
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
+
+# Playwright + Chromium (handles all system deps automatically)
+RUN playwright install --with-deps chromium
+
+# WeasyPrint system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libgdk-pixbuf2.0-0 \
+    libffi-dev \
+    shared-mime-info \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Application code
 COPY app/ ./app/
+
 EXPOSE 8000
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]