docs: 添加 UE5.7 项目 Git 配置与开发规范

- 优化 .gitignore 为 UE5.7 专用版本（新增 Rider/VSCode/日志/崩溃/系统文件等）
- 添加 .gitattributes 配置二进制资产处理与 Git LFS 追踪
- 添加 docs/GIT-GUIDE.md 分支策略与提交规范文档
- 添加 .claude/settings.json 项目级权限配置

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -1,40 +1,11 @@
-# ---> UnrealEngine
-# Visual Studio 2015 user specific files
+# ==============================
+# ChildHood - UE5.7 Git Ignore
+# ==============================
+
+# ==============================
+# Visual Studio
+# ==============================
 .vs/
-
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
-*.ipa
-
-# These project files can be generated by the engine
-*.xcodeproj
-*.xcworkspace
 *.sln
 *.suo
 *.opensdf
@@ -42,35 +13,87 @@
 *.VC.db
 *.VC.opendb
 
-# Precompiled Assets
+# ==============================
+# JetBrains Rider
+# ==============================
+.idea/
+*.csproj
+*.DotSettings.user
+
+# ==============================
+# VS Code
+# ==============================
+.vscode/
+
+# ==============================
+# 编译产物
+# ==============================
+*.o
+*.obj
+*.pch
+*.gch
+*.dll
+*.so
+*.dylib
+*.lib
+*.a
+*.pdb
+*.exe
+*.out
+*.ipa
+
+# ==============================
+# UE5 引擎生成目录
+# ==============================
+Binaries/
+Intermediate/
+DerivedDataCache/
+Saved/
+Build/
+Staging/
+Script/
+
+# 插件内的编译产物
+Plugins/**/Binaries/
+Plugins/**/Intermediate/
+
+# 保留 Build 中的图标和 PakBlacklist
+!Build/**/*.ico
+!Build/*/PakBlacklist*.txt
+
+# ==============================
+# UE5 烘焙数据
+# ==============================
+*_BuiltData.uasset
+
+# ==============================
+# 预编译资源源文件
+# ==============================
 SourceArt/**/*.png
 SourceArt/**/*.tga
 
-# Binary Files
-Binaries/*
-Plugins/**/Binaries/*
+# ==============================
+# 日志与崩溃报告
+# ==============================
+*.log
+CrashReportClient/
 
-# Builds
-Build/*
+# ==============================
+# 系统文件
+# ==============================
+.DS_Store
+Thumbs.db
+Desktop.ini
+*.lnk
 
-# Whitelist PakBlacklist-<BuildConfiguration>.txt files
-!Build/*/
-Build/*/**
-!Build/*/PakBlacklist*.txt
-
-# Don't ignore icon files in Build
-!Build/**/*.ico
-
-# Built data for maps
-*_BuiltData.uasset
-
-# Configuration files generated by the Editor
-Saved/*
-
-# Compiled source files for the engine to use
-Intermediate/*
-Plugins/**/Intermediate/*
-
-# Cache files for the editor to use
-DerivedDataCache/*
+# ==============================
+# Git LFS 临时文件
+# ==============================
+*.lfs
 
+# ==============================
+# 其他
+# ==============================
+*.swp
+*.swo
+*~