ci(ui): add github workflows and issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug to help us improve
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report this bug!
+        
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of the bug
+      placeholder: "When I do X, Y happens instead of Z..."
+    validations:
+      required: true
+      
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll to '...'
+        4. See error
+    validations:
+      required: true
+      
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+      
+  - type: input
+    id: browser
+    attributes:
+      label: Browser
+      description: Which browser(s) are you experiencing the issue?
+      placeholder: "Chrome 120, Firefox 121, Safari 17..."
+      
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: Add screenshots if applicable
+      
+  - type: dropdown
+    id: severity
+    attributes:
+      label: Severity
+      options:
+        - Low - Minor inconvenience
+        - Medium - Affects functionality
+        - High - Major feature broken
+        - Critical - Site unusable
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature!
+        
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem/Use Case
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: "I'm always frustrated when..."
+      
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+    validations:
+      required: true
+      
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any alternative solutions you've considered?
+      
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority
+      options:
+        - Low - Nice to have
+        - Medium - Would improve experience
+        - High - Important for usability
+    validations:
+      required: true
+      
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context, mockups, or screenshots

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Brief description of changes -->
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+
+## Checklist
+
+- [ ] I have followed the [Contributing Guidelines](CONTRIBUTING.md)
+- [ ] Lint passes (`npm run lint`)
+- [ ] Build succeeds (`npm run build`)
+- [ ] I have tested my changes locally
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots here -->
+
+## Related Issues
+
+<!-- Link any related issues: Closes #123 -->

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+    open-pull-requests-limit: 5
+    reviewers:
+      - "tuan-dat-tran"
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "deps"
+      include: "scope"
+      
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+    open-pull-requests-limit: 3
+    reviewers:
+      - "tuan-dat-tran"
+    labels:
+      - "dependencies"
+      - "github-actions"
+    commit-message:
+      prefix: "ci"
+      include: "scope"

.github/workflows/deploy.yml

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+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          
+      - name: Install dependencies
+        run: npm ci
+        
+      - name: Build
+        run: npm run build
+        env:
+          BASE_URL: /${{ github.event.repository.name }}/
+          
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+        
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: 'dist'
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/stale.yml

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+name: Stale Issues
+
+on:
+  schedule:
+    - cron: '30 1 * * *'
+  workflow_dispatch:
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          days-before-issue-stale: 60
+          days-before-issue-close: 14
+          days-before-pr-stale: 30
+          days-before-pr-close: 14
+          stale-issue-message: |
+            This issue has been automatically marked as stale because it has not had recent activity.
+            It will be closed if no further activity occurs within 14 days.
+            Thank you for your contributions.
+          stale-pr-message: |
+            This PR has been automatically marked as stale because it has not had recent activity.
+            It will be closed if no further activity occurs within 14 days.
+            Thank you for your contributions.
+          close-issue-message: |
+            This issue was closed because it has been stalled for 14 days with no activity.
+          close-pr-message: |
+            This PR was closed because it has been stalled for 14 days with no activity.
+          stale-issue-label: 'stale'
+          stale-pr-label: 'stale'
+          exempt-issue-labels: 'pinned,security,bug'
+          exempt-pr-labels: 'pinned,security'