Initial commit: Invoice field extraction system using YOLO + OCR

Features:
- Auto-labeling pipeline: CSV values -> PDF search -> YOLO annotations
- Flexible date matching: year-month match, nearby date tolerance
- PDF text extraction with PyMuPDF
- OCR support for scanned documents (PaddleOCR)
- YOLO training and inference pipeline
- 7 field types: InvoiceNumber, InvoiceDate, InvoiceDueDate, OCR, Bankgiro, Plusgiro, Amount

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

scripts/setup_wsl.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+# WSL 环境安装脚本
+# 使用方法: bash scripts/setup_wsl.sh
+
+set -e
+
+echo "=========================================="
+echo "Invoice Master POC v2 - WSL 安装脚本"
+echo "=========================================="
+
+# 检查是否在 WSL 中运行
+if ! grep -qi microsoft /proc/version 2>/dev/null; then
+    echo "警告: 未检测到 WSL 环境，请在 WSL 中运行此脚本"
+    echo "提示: 在 Windows 终端中输入 'wsl' 进入 WSL"
+    exit 1
+fi
+
+echo ""
+echo "[1/5] 更新系统包..."
+sudo apt update
+
+echo ""
+echo "[2/5] 安装系统依赖..."
+sudo apt install -y \
+    python3.10 \
+    python3.10-venv \
+    python3-pip \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    libsm6 \
+    libxrender1 \
+    libxext6 \
+    libgomp1
+
+echo ""
+echo "[3/5] 创建 Python 虚拟环境..."
+if [ -d "venv" ]; then
+    echo "虚拟环境已存在，跳过创建"
+else
+    python3 -m venv venv
+fi
+
+echo ""
+echo "[4/5] 激活虚拟环境并安装依赖..."
+source venv/bin/activate
+pip install --upgrade pip
+
+echo ""
+echo "安装 Python 依赖包..."
+pip install -r requirements.txt
+
+echo ""
+echo "[5/5] 验证安装..."
+python3 -c "import fitz; print(f'PyMuPDF: {fitz.version}')"
+python3 -c "from ultralytics import YOLO; print('Ultralytics: OK')"
+python3 -c "from paddleocr import PaddleOCR; print('PaddleOCR: OK')"
+
+echo ""
+echo "=========================================="
+echo "安装完成!"
+echo "=========================================="
+echo ""
+echo "使用方法:"
+echo "  1. 激活虚拟环境: source venv/bin/activate"
+echo "  2. 运行自动标注: python -m src.cli.autolabel --help"
+echo "  3. 训练模型:     python -m src.cli.train --help"
+echo "  4. 推理:         python -m src.cli.infer --help"
+echo ""
+
+# 检查 GPU
+echo "检查 GPU 支持..."
+if command -v nvidia-smi &> /dev/null; then
+    echo "检测到 NVIDIA GPU:"
+    nvidia-smi --query-gpu=name,memory.total --format=csv,noheader
+    echo ""
+    echo "提示: 运行以下命令启用 GPU 加速:"
+    echo "  pip install paddlepaddle-gpu"
+else
+    echo "未检测到 GPU，将使用 CPU 模式"
+fi