Reduce downtime during platform stack applies

CrowdSec fixes:
- Increase ResourceQuota requests.cpu 1→4 (was at 302%, blocking upgrades)
- Add LAPI startupProbe: 30 attempts × 10s = 5min startup window
  (LAPI pods were failing default startup probe during rolling upgrades)
- Reduce Helm timeout 3600s→900s with wait=true, wait_for_jobs=true

Prometheus startup guard on 8 rate-based alerts:
- PodCrashLooping, ContainerOOMKilled, CoreDNSErrors,
  HighServiceErrorRate, HighService4xxRate, HighServiceLatency,
  SSDHighWriteRate, HDDHighWriteRate
- Suppresses false positives for 15m after Prometheus restart

stacks/platform/modules/crowdsec/values.yaml

@@ -56,6 +56,12 @@ lapi:
       memory: 128Mi
     limits:
       memory: 1Gi
+  startupProbe:
+    httpGet:
+      path: /health
+      port: 8080
+    failureThreshold: 30
+    periodSeconds: 10
   priorityClassName: "tier-1-cluster"
   replicas: 3
   topologySpreadConstraints: