docs(ai): improve onboarding steps

- Add `npm run lint` to README verification steps.
- Update CONTRIBUTING.md to clarify build prerequisites for linting.
- Update .devcontainer/devcontainer.json to use `npx playwright install --with-deps`.
- Generate ONBOARDING_REPORT.md.

Co-authored-by: PR0M3TH3AN <[email protected]>

.devcontainer/devcontainer.json

@@ -7,7 +7,7 @@
 	"forwardPorts": [
 		3000
 	],
-	"postCreateCommand": "npm ci && npm run build && npx playwright install",
+	"postCreateCommand": "npm ci && npm run build && npx playwright install --with-deps",
 	"customizations": {
 		"vscode": {
 			"extensions": [