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-core/src/traits/mod.rs

@@ -1,5 +1,9 @@
+pub mod dast_agent;
+pub mod graph_builder;
 pub mod issue_tracker;
 pub mod scanner;
 
+pub use dast_agent::{DastAgent, DastContext, DiscoveredEndpoint, EndpointParameter};
+pub use graph_builder::{LanguageParser, ParseOutput};
 pub use issue_tracker::IssueTracker;
 pub use scanner::{ScanOutput, Scanner};