feat(stt): recherche web (SearXNG in-cluster) + fix cluster_status (#49)

Phase 2 d'Asa agentique : nouvel outil web_search adossé à un SearXNG
self-host in-cluster, + correction du faux positif de cluster_status.

- SearXNG (k8s/apps/searxng/) : Deployment + Service + ConfigMap settings.yml
  + IngressRoute searxng.lab.local, Application ArgoCD. Namespace ai, interne
  (l'outil tape http://searxng:8080). use_default_settings + search.formats
  inclut json (sinon API JSON 403) ; limiter/image_proxy off ; image pinnée ;
  conf copiée dans un emptyDir via initContainer (contourne le mount RO) ;
  PodSecurity restricted.
- Outil web_search (tools._web_search) ajouté au contexte asa + STT_SEARXNG_URL.
- fix(cluster_status) : les pods de CronJob TERMINÉS (Succeeded/Failed, ex.
  sacrifice-assign-renfort) comptaient comme « non prêts » → fausse alarme.
  Join kube_pod_status_phase{phase=~"Running |Pending"} (3 faux positifs → 0,
  validé in-cluster).
- Serveur 0.8.0 ; doc stt.md + journal mis à jour.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

k8s/apps-of-apps/apps/searxng.yaml

@@ -0,0 +1,24 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: searxng
+  namespace: argocd
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+  source:
+    repoURL: git@github.com:Alkatrazz24/Funk-lab.git
+    targetRevision: main
+    path: k8s/apps/searxng
+    directory:
+      recurse: true
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: ai
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true