refactor: one self-contained folder per platform service

Each platform/apps/<service>/ now holds its own application.yaml
(multi-source: chart + values + raw-manifest extras), values.yaml, and
any extra manifests (HTTPRoute, RBAC, ClusterSecretStore) together,
replacing the split apps/*.yaml + manifests/*/ + separate *-config
Application pattern.

Root platform-app.yaml now recurses platform/apps/*/application.yaml
only. Extras get a resource-level sync-wave (1) so they still land
after their service's Helm chart within the same Application sync.

Also adds an HTTPRoute for vault (vault.fireflylab.local) - exposed
same as every other service here, accepted as LAN-only exposure.

platform/apps/sonarqube/values.yaml

@@ -0,0 +1,17 @@
+postgresql:
+  enabled: false
+
+persistence:
+  enabled: true
+  storageClass: nfs-delete
+  size: 20Gi
+
+service:
+  type: ClusterIP
+
+resources:
+  requests:
+    cpu: 500m
+    memory: 2Gi
+  limits:
+    memory: 4Gi