feat: complete AIUI integration — all 31 overnight tasks

- Protocol: 10 context categories (apps, system, network, bitcoin, media, files, notes, search, ai-local, wallet)
- ContextBroker: real data wiring for all categories with sanitization
- Permissions: user toggles for all categories in Settings
- Nginx: Claude API, OpenRouter, SearXNG proxy pass-through
- Actions: launch-app, search-web, install-app handlers
- Chat.vue: loading state + connection indicator
- Integration test page: test-aiui.html

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/frontend-dev/SKILL.md

@@ -0,0 +1,20 @@
+---
+name: frontend-dev
+description: Start the local frontend development environment for Archipelago
+disable-model-invocation: true
+allowed-tools: Bash
+---
+
+Start the local frontend development environment.
+
+```bash
+cd neode-ui && npm start
+```
+
+This starts:
+- **Mock backend** on port 5959 (simulates the Rust backend API)
+- **Vite dev server** on port 8100
+
+Access at http://localhost:8100 (password: `password123`)
+
+The mock backend lets you develop the UI without needing the live server.