chore: add issue/PR templates and changelog setup (#56)

- Add bug report issue template (YAML form) with Affected Area dropdown
- Add issue template config to disable blank issues and redirect to Discussions
- Add PR template with type of change, affected area, and checklist
- Install conventional-changelog-cli and add changelog script
- Create initial CHANGELOG.md

Co-authored-by: babydog-ai <willchen.babydog@gmail.com>

Author: chen201724

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug in yuque-ecosystem
+labels: ["bug"]
+body:
+  - type: dropdown
+    id: area
+    attributes:
+      label: Affected Area
+      description: Which part of the ecosystem is affected?
+      options:
+        - Website
+        - Claude Code Plugin
+        - OpenClaw Plugin
+        - Shared
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version are you using?
+      placeholder: e.g. 1.0.0
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: Provide a clear set of steps to reproduce the bug.
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: |
+        Any relevant environment info (OS, browser, Node.js version, etc.)
+      placeholder: |
+        - OS: macOS 15.0
+        - Browser: Chrome 130
+        - Node.js: 22.0.0
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions
+    url: https://github.com/yuque/yuque-ecosystem/discussions/categories/q-a
+    about: Ask questions and get help from the community.
+  - name: Feature Requests
+    url: https://github.com/yuque/yuque-ecosystem/discussions/categories/ideas
+    about: Suggest new features or improvements.

.github/PULL_REQUEST_TEMPLATE.md

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+## What does this PR do?
+
+<!-- A brief description of the changes. -->
+
+## Related Issues
+
+<!-- Link related issues: fixes #xxx, closes #xxx -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Refactor
+- [ ] Performance improvement
+
+## Affected Area
+
+- [ ] Website
+- [ ] Claude Code Plugin
+- [ ] OpenClaw Plugin
+- [ ] Shared
+
+## Checklist
+
+- [ ] I have tested my changes locally
+- [ ] I have updated relevant documentation
+- [ ] My changes do not introduce breaking changes
+- [ ] I have added a changelog entry below (if applicable)
+
+## Changelog Entry
+
+<!-- If applicable, describe the change for the changelog. -->
+<!-- Example: fix(website): resolve navigation issue on mobile -->

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This changelog is automatically generated based on [Conventional Commits](https://www.conventionalcommits.org/).