feat: add GitHub issue templates for bug, feature, and question

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or unexpected behavior
+title: "[Bug] "
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      placeholder: A clear description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Flash firmware with ...
+        2. Send message ...
+        3. See error ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      placeholder: What you expected to happen.
+    validations:
+      required: false
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Screenshots
+      placeholder: Paste serial monitor output or screenshots here.
+      render: shell
+    validations:
+      required: false
+  - type: input
+    id: board
+    attributes:
+      label: Board / Hardware
+      placeholder: e.g. Xiaozhi ESP32-S3 16MB/8MB
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Discord
+    url: https://discord.gg/r8ZxSvB8Yr
+    about: Join our Discord for quick help and discussion

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or improvement
+title: "[Feature] "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature
+      placeholder: A clear description of the feature you'd like.
+    validations:
+      required: true
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      placeholder: Why do you want this? What problem does it solve?
+    validations:
+      required: false
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      placeholder: Any alternative solutions or workarounds you've considered.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question about setup, usage, or development
+title: "[Question] "
+labels: ["question"]
+body:
+  - type: textarea
+    id: question
+    attributes:
+      label: Your question
+      placeholder: What would you like to know?
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      placeholder: Any relevant details about your setup or what you've tried.
+    validations:
+      required: false