Add DAST, graph modules, toast notifications, and dashboard enhancements

Add DAST scanning and code knowledge graph features across the stack:
- compliance-dast and compliance-graph workspace crates
- Agent API handlers and routes for DAST targets/scans and graph builds
- Core models and traits for DAST and graph domains
- Dashboard pages for DAST targets/findings/overview and graph explorer/impact
- Toast notification system with auto-dismiss for async action feedback
- Button click animations and disabled states for better UX

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

compliance-dashboard/src/infrastructure/mod.rs

@@ -1,6 +1,8 @@
 // Server function modules (compiled for both web and server;
 // the #[server] macro generates client stubs for the web target)
+pub mod dast;
 pub mod findings;
+pub mod graph;
 pub mod issues;
 pub mod repositories;
 pub mod sbom;