feat: active config snapshot, composite StatusDot with tooltip

Part 1 — Config snapshot:
- V8 migration adds resolved_config JSONB to deployments table
- DeploymentExecutor saves the full resolved config at deploy time
- Deployment record includes resolvedConfig for auditability

Part 2 — Composite health StatusDot:
- CatalogController computes composite health from deployment status +
  agent health (green only when RUNNING AND agent live)
- CatalogApp includes healthTooltip (e.g. "Deployment: RUNNING,
  Agents: live (1 connected)")
- StatusDot added to app detail header with deployment status Badge
- StatusDot added to deployment table rows
- Sidebar passes composite health + tooltip through to tree nodes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/LayoutShell.tsx

@@ -403,7 +403,8 @@ function LayoutContent() {
       .map((app: any) => ({
         id: app.slug,
         name: app.displayName || app.slug,
-        health: (app.health === 'offline' ? 'dead' : app.health) as 'live' | 'stale' | 'dead',
+        health: (app.health === 'offline' ? 'dead' : app.health) as SidebarApp['health'],
+        healthTooltip: app.healthTooltip,
         exchangeCount: app.exchangeCount,
         routes: [...(app.routes || [])]
           .sort((a: any, b: any) => cmp(a.routeId, b.routeId))