chore: add GitHub issue and PR templates with automation workflows

- Add bilingual issue templates (English & Chinese)
  - Bug report template with prerequisite checkboxes
  - Feature request template
  - Question template
  - Reverse checkbox detection ("I have not read carefully")

- Add bilingual PR templates (English & Chinese)
  - Comprehensive checklist for code quality and testing
  - Test environment documentation section
  - Breaking changes section

- Add GitHub Actions workflows
  - Auto-labeling based on issue content
  - Auto-close issues with unchecked prerequisites
  - Stale issue and PR management (90/60 days)

- Add template configuration
  - External links for discussions and wiki
  - Template chooser interface

2 files changed, 238 insertions, 0 deletions

diff --git a/.github/PULL_REQUEST_TEMPLATE/cn-pull_request_template.md b/.github/PULL_REQUEST_TEMPLATE/cn-pull_request_template.md
new file mode 100644
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+++ b/.github/PULL_REQUEST_TEMPLATE/cn-pull_request_template.md
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+# 描述
+
+<!-- 简要描述此 PR 的更改内容 -->
+
+## 更改类型
+
+<!-- 用 "x" 标记相关选项 -->
+
+- [ ] Bug 修复（修复问题的非破坏性更改）
+- [ ] 新功能（添加功能的非破坏性更改）
+- [ ] 破坏性更改（会导致现有功能无法正常工作的修复或功能）
+- [ ] 文档更新
+- [ ] UI/UX 改进
+- [ ] 性能优化
+- [ ] 代码重构（无功能性更改）
+- [ ] 配置更改
+- [ ] 测试添加或更新
+
+## 相关 Issue
+
+<!-- 使用 #issue_number 链接相关 issue -->
+
+关闭 #
+相关 #
+
+## 更改内容
+
+<!-- 详细描述更改内容 -->
+
+### 后端 (Rust)
+
+-
+
+### 前端 (Svelte)
+
+-
+
+### 配置
+
+-
+
+## 测试
+
+<!-- 描述你运行的测试以及如何复现 -->
+
+### 测试环境
+
+- **操作系统**：<!-- 例如：Windows 11、macOS 14、Ubuntu 22.04 -->
+- **DropOut 版本**：<!-- 例如：0.1.23 -->
+- **测试的 Minecraft 版本**：<!-- 例如：1.21.1 -->
+- **Mod 加载器**：<!-- 例如：Fabric 0.16.0、Forge 49.0.3 或 无 -->
+
+### 测试用例
+
+- [ ] 已在 Windows 上测试
+- [ ] 已在 macOS 上测试
+- [ ] 已在 Linux 上测试
+- [ ] 已测试原版 Minecraft
+- [ ] 已测试 Fabric
+- [ ] 已测试 Forge
+- [ ] 已测试游戏启动
+- [ ] 已测试登录流程
+- [ ] 已测试 Java 检测/下载
+
+### 测试步骤
+
+1.
+2.
+3.
+
+## 检查清单
+
+<!-- 用 "x" 标记已完成的项目 -->
+
+### 代码质量
+
+- [ ] 我的代码遵循项目的代码风格指南
+- [ ] 我已对自己的代码进行了自审
+- [ ] 我已对难以理解的区域添加了注释
+- [ ] 我的更改没有产生新的警告或错误
+
+### 测试验证
+
+- [ ] 我已在本地测试了我的更改
+- [ ] 我已添加测试来证明我的修复有效或功能正常工作
+- [ ] 新的和现有的单元测试在本地通过
+- [ ] 我至少在一个目标平台上进行了测试
+
+### 文档更新
+
+- [ ] 我已相应地更新了文档
+- [ ] 如有需要，我已更新 README
+- [ ] 我已在必要处添加/更新代码注释
+
+### 依赖项
+
+- [ ] 我已检查没有添加不必要的依赖项
+- [ ] 所有新依赖项都已正确记录
+- [ ] `Cargo.lock` 和/或 `pnpm-lock.yaml` 已更新（如果依赖项有变化）
+
+## 截图 / 视频
+
+<!-- 如适用，添加截图或视频来展示更改 -->
+
+## 附加说明
+
+<!-- 在此添加关于此 PR 的其他上下文 -->
+
+## 破坏性更改说明
+
+<!-- 如果这是破坏性更改，请描述用户的迁移路径 -->
+
+---
+
+**维护者专用：**
+
+- [ ] 代码审查已完成
+- [ ] CI 检查通过
+- [ ] 准备合并
diff --git a/.github/PULL_REQUEST_TEMPLATE/en-pull_request_template.md b/.github/PULL_REQUEST_TEMPLATE/en-pull_request_template.md
new file mode 100644
index 0000000..b9b9745
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE/en-pull_request_template.md
@@ -0,0 +1,119 @@
+# Description
+
+<!-- Provide a brief description of the changes in this PR -->
+
+## Type of Change
+
+<!-- Mark the relevant option with an "x" -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] UI/UX improvement
+- [ ] Performance improvement
+- [ ] Code refactoring (no functional changes)
+- [ ] Configuration change
+- [ ] Test addition or update
+
+## Related Issues
+
+<!-- Link to related issues using #issue_number -->
+
+Closes #
+Related to #
+
+## Changes Made
+
+<!-- Describe the changes in detail -->
+
+### Backend (Rust)
+
+-
+
+### Frontend (Svelte)
+
+-
+
+### Configuration
+
+-
+
+## Testing
+
+<!-- Describe the tests you ran and how to reproduce them -->
+
+### Test Environment
+
+- **OS**: <!-- e.g., Windows 11, macOS 14, Ubuntu 22.04 -->
+- **DropOut Version**: <!-- e.g., 0.1.23 -->
+- **Minecraft Version Tested**: <!-- e.g., 1.21.1 -->
+- **Mod Loader**: <!-- e.g., Fabric 0.16.0, Forge 49.0.3, or N/A -->
+
+### Test Cases
+
+- [ ] Tested on Windows
+- [ ] Tested on macOS
+- [ ] Tested on Linux
+- [ ] Tested with vanilla Minecraft
+- [ ] Tested with Fabric
+- [ ] Tested with Forge
+- [ ] Tested game launch
+- [ ] Tested authentication flow
+- [ ] Tested Java detection/download
+
+### Steps to Test
+
+1.
+2.
+3.
+
+## Checklist
+
+<!-- Mark completed items with an "x" -->
+
+### Code Quality
+
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] My changes generate no new warnings or errors
+
+### Testing Verification
+
+- [ ] I have tested my changes locally
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have tested on at least one target platform
+
+### Documentation
+
+- [ ] I have updated the documentation accordingly
+- [ ] I have updated the README if needed
+- [ ] I have added/updated code comments where necessary
+
+### Dependencies
+
+- [ ] I have checked that no unnecessary dependencies were added
+- [ ] All new dependencies are properly documented
+- [ ] `Cargo.lock` and/or `pnpm-lock.yaml` are updated (if dependencies changed)
+
+## Screenshots / Videos
+
+<!-- If applicable, add screenshots or videos to demonstrate the changes -->
+
+## Additional Notes
+
+<!-- Add any other context about the PR here -->
+
+## Breaking Changes
+
+<!-- If this is a breaking change, describe the migration path for users -->
+
+---
+
+**For Maintainers:**
+
+- [ ] Code review completed
+- [ ] CI checks passing
+- [ ] Ready to merge