fix: increase liveness/readiness probe timeouts for initial build

First-time startup requires 3-5 minutes for composer install, npm install,
and Vite build. Increased probe delays to prevent premature restarts:
- Liveness: 90s → 300s (5 minutes)
- Readiness: 60s → 240s (4 minutes)

Subsequent starts are still fast (~10 seconds) since code is volume-mounted
and dependencies are already installed.

k8s/local/deployment.yaml

@@ -108,7 +108,7 @@ spec:
           httpGet:
             path: /
             port: 80
-          initialDelaySeconds: 90
+          initialDelaySeconds: 300
           periodSeconds: 10
           timeoutSeconds: 5
           failureThreshold: 6
@@ -117,7 +117,7 @@ spec:
           httpGet:
             path: /
             port: 80
-          initialDelaySeconds: 60
+          initialDelaySeconds: 240
           periodSeconds: 5
           timeoutSeconds: 3
           failureThreshold: 6