refactor(scenarios): split monolithic configuration into individual files

- Split `scenarios/scenarios.json` into individual JSON files under `scenarios/data/` named `<scenario-id>.json`
- Split `scenarios/bundles.json` into individual JSON files under `scenarios/bundles/` named `<bundle-id>.json`
- Updated `backend/server.js` to dynamically load scenario and bundle files from their respective directories
- Updated documentation in `scenarios/SCHEMA.md` and `README.md` to reflect the new repository layout and contributor workflow

Signed-off-by: Abhinav Sinha <[email protected]>

scenarios/bundles/k8s-security.json

@@ -0,0 +1,36 @@
+{
+  "id": "k8s-security",
+  "name": "Kubernetes Security",
+  "icon": "🛡",
+  "tagline": "CKS exam — hardening and threats",
+  "color": "#f97316",
+  "colorDim": "rgba(249,115,22,0.12)",
+  "exam_minutes": 120,
+  "scenario_ids": [
+    "cks-network-policy",
+    "cks-pod-security-context",
+    "cks-rbac-least-privilege",
+    "cks-seccomp-profile",
+    "cks-immutable-secret",
+    "cks-apparmor-profile",
+    "cks-automount-token",
+    "cks-network-policy-metadata",
+    "cks-rbac-clusterrole",
+    "cks-psa-namespace",
+    "cks-mcq-runtime-security",
+    "cks-mcq-api-server",
+    "cks-mcq-image-footprint",
+    "cks-mcq-psp-replacement",
+    "cks-mcq-kubelet-auth",
+    "cks-readonly-filesystem",
+    "cks-drop-capabilities",
+    "cks-tls-ingress",
+    "cks-image-pull-secret",
+    "cks-mcq-sandboxing",
+    "cks-mcq-audit-policy",
+    "cks-runtime-class",
+    "cks-audit-policy",
+    "cks-egress-namespace",
+    "cks-non-root-enforce"
+  ]
+}