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-agent/Cargo.toml

@@ -8,6 +8,8 @@ workspace = true
 
 [dependencies]
 compliance-core = { workspace = true, features = ["mongodb"] }
+compliance-graph = { path = "../compliance-graph" }
+compliance-dast = { path = "../compliance-dast" }
 serde = { workspace = true }
 serde_json = { workspace = true }
 tokio = { workspace = true }