feat: consolidate env config and add deployment files

- Add debug_font_path, demo_docs_dir, e2e_api_base_url to config.py
- Fix hardcoded paths in pp_structure_debug.py, create_demo_images.py
- Fix hardcoded paths in test files
- Update .env.example with new configuration options
- Update .gitignore to exclude AI development files (.claude/, openspec/, AGENTS.md, CLAUDE.md)
- Add production startup script (start-prod.sh)
- Add README.md with project documentation
- Add 1panel Docker deployment files (docker-compose.yml, Dockerfiles, nginx.conf)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deploy/1panel/Dockerfile.backend

@@ -0,0 +1,67 @@
+# Tool_OCR Backend Dockerfile
+# Multi-stage build for optimized image size
+
+# Stage 1: Build environment
+FROM python:3.12-slim as builder
+
+WORKDIR /build
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install dependencies
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir --user -r requirements.txt
+
+# Stage 2: Runtime environment
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    libsm6 \
+    libxext6 \
+    libxrender1 \
+    libgomp1 \
+    pandoc \
+    poppler-utils \
+    fonts-dejavu-core \
+    fonts-noto-cjk \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Python packages from builder
+COPY --from=builder /root/.local /root/.local
+ENV PATH=/root/.local/bin:$PATH
+
+# Copy application code
+COPY backend/ /app/backend/
+
+# Create necessary directories
+RUN mkdir -p /app/backend/uploads/{temp,processed,images} \
+    && mkdir -p /app/backend/storage/{markdown,json,exports,results} \
+    && mkdir -p /app/backend/models/paddleocr \
+    && mkdir -p /app/backend/logs
+
+# Set working directory
+WORKDIR /app/backend
+
+# Environment variables
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONDONTWRITEBYTECODE=1
+
+# Expose port
+EXPOSE 8000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD curl -f http://localhost:8000/health || exit 1
+
+# Run application
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]