Add initial work from Codex

frontend/.env.example

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+VITE_API_BASE_URL=http://localhost:8000
+VITE_OTEL_COLLECTOR_ENDPOINT=http://localhost:4318
+# K8s + Alloy example:
+# VITE_OTEL_COLLECTOR_ENDPOINT=http://alloy.monitoring.svc.cluster.local:4318
+VITE_OTEL_SERVICE_NAME=otel-bi-frontend
+VITE_OTEL_SERVICE_NAMESPACE=final-thesis
+
+VITE_OIDC_ENABLED=true
+VITE_OIDC_AUTHORITY=https://<your-idp-domain>/realms/<your-realm>
+VITE_OIDC_CLIENT_ID=otel-bi-frontend
+VITE_OIDC_REDIRECT_URI=http://localhost:5173
+VITE_OIDC_POST_LOGOUT_REDIRECT_URI=http://localhost:5173
+VITE_OIDC_SCOPE=openid profile email