chore: add bug report and feature request issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Something isn't working as expected
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: Describe the bug clearly. Include the exact error message if any.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Minimal steps to reproduce the issue.
+      placeholder: |
+        1. inkos init test
+        2. inkos book create --title '...' --genre xuanhuan
+        3. inkos write next ...
+        4. See error: ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What should have happened instead?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: InkOS version
+      description: Output of `inkos --version`
+      placeholder: "0.4.5"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      options:
+        - macOS
+        - Linux
+        - Windows (WSL)
+        - Windows (native)
+    validations:
+      required: true
+
+  - type: input
+    id: model
+    attributes:
+      label: LLM provider / model
+      description: e.g. openai/gpt-4o, anthropic/claude-sonnet, ollama/qwen3:8b
+      placeholder: "openai/gpt-4o"
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant logs
+      description: Paste any error output, truncated chapter content, or debug logs.
+      render: shell
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Documentation
+    url: https://github.com/Narcooo/inkos#readme
+    about: Check the README before opening an issue

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or improvement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem does this solve? What's the current pain point?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: How should it work? Include CLI examples if applicable.
+      placeholder: |
+        ```bash
+        inkos <new-command> --flag value
+        ```
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Any workarounds you've tried, or other approaches you considered.
+    validations:
+      required: false
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Screenshots, related issues, links, etc.
+    validations:
+      required: false