feat: pentest onboarding — streaming, browser automation, reports, user cleanup (#16)

Complete pentest feature overhaul: SSE streaming, session-persistent browser tool (CDP), AES-256 credential encryption, auto-screenshots in reports, code-level remediation correlation, SAST triage chunking, context window optimization, test user cleanup (Keycloak/Auth0/Okta), wizard dropdowns, attack chain improvements, architecture docs with Mermaid diagrams.

Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Reviewed-on: #16

docs/package.json

@@ -8,5 +8,9 @@
   },
   "devDependencies": {
     "vitepress": "^1.6.4"
+  },
+  "dependencies": {
+    "mermaid": "^11.13.0",
+    "vitepress-plugin-mermaid": "^2.0.17"
   }
 }