INIT(api): add FastAPI application

- Initialize FastAPI project structure
- Add basic API configuration

deploy/docker/Dockerfile.dev

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+# Development Dockerfile for Joossam FastAPI OMR Grading Service
+FROM python:3.11-slim
+
+# 시스템 의존성 설치 (OpenCV용)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    libsm6 \
+    libxext6 \
+    libxrender-dev \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Python 의존성 설치
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# 개발용 의존성 추가
+RUN pip install --no-cache-dir watchfiles
+
+# 애플리케이션 코드 복사
+COPY . .
+
+EXPOSE 8000
+
+# 헬스체크
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8000/health || exit 1
+
+# 개발 서버 실행 (hot-reload 활성화)
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]
+