chore(github): migrate feature suggestions and q&a to discussions and update Issue configuration

.github/DISCUSSION_TEMPLATE/ideas.yml

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+body:
+  - type: textarea
+    attributes:
+      label: 想法产生的背景 / Background of the idea
+      description: 为什么我们确实需要它？ / Why do we really need it?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: 具体想法或解决方案 / Specific idea or solution
+      description: 请尽量详细地描述你的想法或方案 / Please describe your idea or proposal in detail.
+    validations:
+      required: true

.github/DISCUSSION_TEMPLATE/q-a.yml

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+body:
+  - type: textarea
+    attributes:
+      label: 问题 / Question
+      description: 直接描述你遇到的问题或想问的点（越具体越好）/ Describe your question (the more specific, the better).
+      placeholder: |
+        我在……时遇到……
+        期望……，但实际……
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: 已尝试 / What you tried
+      description: 你已经试过哪些方法？结果如何？/ What have you tried and what happened?
+      placeholder: |
+        我尝试了……
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: AstrBot 版本
+      description: 你也可以补充有关此问题的其它环境信息 / You can also provide other environment information related to this problem.
+      value: |
+        - AstrBot 版本：
+        - 部署方式：
+        - 其它：
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+# Contact links 会显示在“新建 Issue”页面，引导用户去正确的渠道。
+contact_links:
+  - name: 💡 功能想法 / Ideas
+    url: https://github.com/AstrBotDevs/AstrBot/discussions/new?category=ideas
+    about: 你对现有功能的想法或对新需求的讨论 / Your thoughts on existing features or discuss new requirements
+  - name: ❓ 使用问题 / Questions
+    url: https://github.com/AstrBotDevs/AstrBot/discussions/new?category=q-a
+    about: 使用问题与排错问答 / Usage issues and troubleshooting Q&A
+
+