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/public/manifest.json

@@ -0,0 +1,21 @@
+{
+  "name": "Memory Viewer",
+  "short_name": "Memory",
+  "description": "Browse and edit your AI agent's memory files",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#030712",
+  "theme_color": "#030712",
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}