feat: initial SleepGuard implementation

Wake-on-demand proxy + agent system with SvelteKit dashboard.
Monorepo: shared types, proxy (Hono + http-proxy), agent (monitors + locks), web (SvelteKit SPA).

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

packages/proxy/web/static/favicon.svg

@@ -0,0 +1,5 @@
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+  <circle cx="16" cy="14" r="4" fill="#3b82f6"/>
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+</svg>