ci: add issue and PR templates with bilingual support

Add GitHub issue templates (bug report, feature request, documentation
issue, question) and PR template. All templates use bilingual format
(English + Chinese) to support the international community.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,75 @@
+name: "Feature Request / 功能请求"
+description: |
+  Propose a new feature or improvement.
+  提出新功能或改进建议。
+labels:
+  - enhancement
+body:
+  - type: checkboxes
+    attributes:
+      label: Self Checks / 自检
+      options:
+        - label: |
+            I have read the [FAQ](https://github.com/farion1231/cc-switch#faq) section in README.
+            我已阅读 README 中的[常见问题](https://github.com/farion1231/cc-switch#常见问题)。
+          required: true
+        - label: |
+            I have searched for [existing issues](https://github.com/farion1231/cc-switch/issues), including closed ones.
+            我已搜索过[已有的 Issue](https://github.com/farion1231/cc-switch/issues)，包括已关闭的。
+          required: true
+
+  - type: dropdown
+    attributes:
+      label: Related App / 涉及应用
+      description: |
+        Which app is this feature for?
+        该功能涉及哪个应用？
+      multiple: true
+      options:
+        - Claude Code
+        - Codex
+        - Gemini CLI
+        - OpenCode
+        - OpenClaw
+        - General / 通用
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Problem or Motivation / 问题或动机
+      description: |
+        Is this request related to a problem? Describe the scenario.
+        这个请求是否与某个问题相关？请描述使用场景。
+      placeholder: |
+        I was trying to ... and found that ...
+        我在尝试……的时候，发现……
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Proposed Solution / 建议方案
+      description: |
+        Describe the solution you'd like.
+        描述你希望的解决方案。
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional Context / 补充信息
+      description: |
+        Any other context, mockups, or screenshots.
+        其他背景信息、设计稿或截图。
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+      label: Contribution / 参与贡献
+      options:
+        - label: |
+            I am interested in contributing to this feature.
+            我有兴趣参与开发此功能。
+          required: false