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/harbor/httproute.yaml

@@ -0,0 +1,22 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: harbor
+  namespace: harbor
+  annotations:
+    argocd.argoproj.io/sync-wave: "1"
+spec:
+  parentRefs:
+    - name: envoy-gateway
+      namespace: envoy-gateway-system
+  hostnames:
+    - "harbor.fireflylab.local"
+  rules:
+    - matches:
+        - path:
+            type: PathPrefix
+            value: /
+      backendRefs:
+        # verify with: kubectl get svc -n harbor  (nginx frontend, combines portal+core+registry)
+        - name: harbor-nginx
+          port: 80