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-appdev.json

@@ -0,0 +1,36 @@
+{
+  "id": "k8s-appdev",
+  "name": "Kubernetes Developer",
+  "icon": "🛠️",
+  "tagline": "CKAD exam — application development",
+  "color": "#bc8cff",
+  "colorDim": "rgba(188,140,255,0.12)",
+  "exam_minutes": 120,
+  "scenario_ids": [
+    "pod-basics-mcq",
+    "kubectl-essentials-mcq",
+    "namespaces-basics",
+    "labels-selectors-mcq",
+    "deploy-nginx",
+    "scale-deployment",
+    "rolling-update-task",
+    "deployment-rollback",
+    "liveness-probe-task",
+    "readiness-probe-task",
+    "configmap-volume",
+    "env-vars-configmap",
+    "secrets-basics",
+    "resource-limits-task",
+    "cronjob-task",
+    "job-task",
+    "emptydir-pod",
+    "pvc-dynamic-task",
+    "services-mcq",
+    "nodeport-task",
+    "ingress-task",
+    "rbac-role",
+    "pod-security-context",
+    "crashloop-fix",
+    "container-logging-mcq"
+  ]
+}