feat: add issue templates for bug reports, feature requests, and questions

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report / 缺陷报告
+description: Report reproducible defects with clear context / 请提供可复现的缺陷信息
+title: "[Bug] "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping us improve Foxel! / 感谢你帮助改进 Foxel！
+        Please confirm the checklist below before filing. / 在提交前请确认以下事项。
+  - type: checkboxes
+    id: validations
+    attributes:
+      label: Pre-flight Check / 提交前检查
+      options:
+        - label: I searched existing issues and docs / 我已搜索现有 Issue 与文档
+          required: true
+        - label: This is not a question or feature request / 这不是问题咨询或功能需求
+          required: true
+  - type: textarea
+    id: summary
+    attributes:
+      label: Bug Summary / 缺陷摘要
+      description: Briefly describe what is wrong / 简要说明出现了什么问题
+      placeholder: e.g. Upload fails with 500 error / 例如：上传时报 500 错误
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce / 复现步骤
+      description: List numbered steps to trigger the bug / 列出触发问题的步骤
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior / 预期行为
+      description: What should happen instead? / 期望看到什么结果？
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior / 实际行为
+      description: What actually happens? Include messages or screenshots / 实际发生了什么？可附报错或截图
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version / 版本信息
+      description: Git commit, tag, or build number / 提供 Git 提交、标签或构建号
+    validations:
+      required: false
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment / 运行环境
+      description: OS, browser, API server config, etc. / 操作系统、浏览器、服务端配置等
+    validations:
+      required: false
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs & Attachments / 日志与附件
+      description: Paste relevant logs, stack traces, screenshots / 粘贴相关日志、堆栈或截图
+      render: shell
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request / 功能需求
+description: Suggest enhancements or new capabilities / 提出改进或新增能力
+title: "[Feature] "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Tell us about your idea! / 欢迎分享你的想法！
+        Please complete the sections below so we can evaluate it quickly. / 请完整填写以下信息，便于快速评估。
+  - type: checkboxes
+    id: prechecks
+    attributes:
+      label: Pre-flight Check / 提交前检查
+      options:
+        - label: I searched existing issues and roadmap / 我已搜索现有 Issue 与路线图
+          required: true
+        - label: This is not a bug report or question / 这不是缺陷或问题咨询
+          required: true
+  - type: textarea
+    id: summary
+    attributes:
+      label: Feature Summary / 功能概述
+      description: What do you want to build? / 希望新增什么能力？
+      placeholder: e.g. Support sharing download links / 例如：支持分享下载链接
+    validations:
+      required: true
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation / 背景与价值
+      description: Why is this feature important? Who benefits? / 为什么重要？受益者是谁？
+    validations:
+      required: true
+  - type: textarea
+    id: scope
+    attributes:
+      label: Proposed Solution / 建议方案
+      description: Outline how the feature might work, including API or UI hints / 描述可能的实现方式，包含 API 或 UI 提示
+    validations:
+      required: false
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives / 可选方案
+      description: List any alternatives considered / 如有考虑过其他方案请列出
+    validations:
+      required: false
+  - type: textarea
+    id: extra
+    attributes:
+      label: Additional Context / 补充信息
+      description: Diagrams, sketches, links, constraints, etc. / 可附上草图、链接或约束
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/question.yml

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+name: Question / 问题咨询
+description: Ask about usage, configuration, or clarification / 用于使用、配置或澄清问题
+title: "[Question] "
+labels:
+  - question
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Need help? You're in the right place. / 需要帮助？请按以下提示填写。
+        Check the docs before filing. / 提交前请先查阅文档。
+  - type: checkboxes
+    id: prechecks
+    attributes:
+      label: Pre-flight Check / 提交前检查
+      options:
+        - label: I searched existing issues and discussions / 我已搜索现有 Issue 和讨论
+          required: true
+        - label: I read the relevant documentation / 我已阅读相关文档
+          required: true
+  - type: textarea
+    id: question
+    attributes:
+      label: Question Details / 问题详情
+      description: What do you need help with? Be specific. / 具体说明需要帮助的内容
+      placeholder: Describe the scenario, expectation, and blockers / 说明场景、期望结果与阻碍
+    validations:
+      required: true
+  - type: textarea
+    id: tried
+    attributes:
+      label: What You Tried / 已尝试方案
+      description: List commands, configs, or steps attempted / 列出尝试过的命令、配置或步骤
+    validations:
+      required: false
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context / 补充信息
+      description: Environment details, logs, screenshots / 可补充运行环境、日志或截图
+    validations:
+      required: false