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>

docker-compose.yml

@@ -9,13 +9,6 @@ services:
     volumes:
       - mongo_data:/data/db
 
-  searxng:
-    image: searxng/searxng:latest
-    ports:
-      - "8888:8080"
-    environment:
-      - SEARXNG_BASE_URL=http://localhost:8888
-
   agent:
     build:
       context: .
@@ -40,6 +33,16 @@ services:
       - mongo
       - agent
 
+  chromium:
+    image: browserless/chrome:latest
+    ports:
+      - "3003:3000"
+    environment:
+      MAX_CONCURRENT_SESSIONS: 5
+      CONNECTION_TIMEOUT: 60000
+      PREBOOT_CHROME: "true"
+    restart: unless-stopped
+
 volumes:
   mongo_data:
   repos_data: