fix: 修复Python 3.13环境下PyInstaller构建崩溃问题

问题:
- PyInstaller在分析阶段尝试导入torch/transformers等ML库
- 这些库与Python 3.13不兼容，导致"Windows fatal exception: access violation"
- 构建过程无法完成，无法生成exe文件

解决方案:
1. 添加pyi_hooks/pyi_rth_ignore_torch.py运行时hook
   - 在PyInstaller分析阶段阻止torch等模块的导入
   - 这些模块将在运行时动态安装

2. 添加pyi_hooks/hook-exclude-ml.py和hook-paddleocr.py
   - 明确告诉PyInstaller不收集这些ML库

3. 更新build.bat和build.sh
   - 使用--runtime-hook和--additional-hooks-dir
   - 添加--exclude-module参数排除所有ML库

测试:
- 验证所有hook文件语法正确
- 验证项目核心功能可以在不导入torch的情况下正常工作

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

pyi_hooks/hook-paddleocr.py

@@ -0,0 +1,29 @@
+"""
+PyInstaller hook for PaddleOCR
+
+Prevents PyInstaller from trying to bundle PaddleOCR and its dependencies.
+These will be installed dynamically at runtime.
+"""
+
+from PyInstaller.utils.hooks import is_module_satisfies
+
+# Tell PyInstaller to NOT collect these modules
+# They will be installed at runtime via ensure_paddleocr()
+
+hiddenimports = []
+
+# Explicitly exclude heavy ML dependencies
+excludedimports = [
+    'torch',
+    'transformers',
+    'tensorflow',
+    'onnx',
+    'onnxruntime',
+    'sentencepiece',
+    'tokenizers',
+    'diffusers',
+    'accelerate',
+    'datasets',
+    'huggingface_hub',
+    'safetensors',
+]