Add memory-viewer from silicondawn

- Web UI for browsing and editing OpenClaw memory files
- Cloned from https://github.com/silicondawn/memory-viewer
- Built and running on port 8901
- Features: file tree, markdown rendering, search, live reload
- Full access to MEMORY.md, daily notes, skills, automations

memory-viewer/.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug to help us improve
+title: "[Bug] "
+labels: bug
+---
+
+## Describe the Bug
+A clear and concise description of what the bug is.
+
+## Steps to Reproduce
+1. Go to '...'
+2. Click on '...'
+3. See error
+
+## Expected Behavior
+What you expected to happen.
+
+## Actual Behavior
+What actually happened.
+
+## Environment
+- OS: [e.g., macOS 15, Ubuntu 24.04]
+- Node.js version: [e.g., 22.x]
+- Browser: [e.g., Chrome 130]
+
+## Screenshots
+If applicable, add screenshots.

memory-viewer/.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+title: "[Feature] "
+labels: enhancement
+---
+
+## Problem
+A clear description of the problem or need. E.g., "I'm always frustrated when..."
+
+## Proposed Solution
+Describe the solution you'd like.
+
+## Alternatives Considered
+Any alternative solutions or features you've considered.
+
+## Additional Context
+Any other context, mockups, or screenshots.