feat(docker): add Dockerfile and docker-compose.yml for containerized deployment

.dockerignore

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+__pycache__/
+*.py[cod]
+*$py.class
+.pytest_cache/
+venv/
+.git/
+.env
+data/
+*.db
+*.db-wal
+*.db-shm

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application source
+COPY . .
+
+# Ensure data directory exists for SQLite WAL storage
+RUN mkdir -p /app/data
+
+ENV HOST=0.0.0.0 \
+    PORT=8002 \
+    PYTHONUNBUFFERED=1
+
+EXPOSE 8002
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8002"]

docker-compose.yml

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+services:
+  study-web:
+    build: .
+    container_name: study-qpid-pro
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8002:8002"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - HOST=0.0.0.0
+      - PORT=8002
+      - DEBUG=False
+      - SECRET_KEY=study-qpid-pro-secret-key-change-in-prod
+      - ADMIN_USERNAME=admin
+      - ADMIN_PASSWORD=adminpass
+      - DB_PATH=/app/data/notes.db