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/searxng/deployment.yaml

@@ -0,0 +1,82 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: searxng
+  namespace: ai
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: searxng
+  template:
+    metadata:
+      labels:
+        app: searxng
+      annotations:
+        # Redéploie le pod quand settings.yml change (le hash bouge → nouveau rollout).
+        checksum/config: "searxng-settings-v1"
+    spec:
+      # Conformité PodSecurity "restricted" (namespace ai). L'image tourne en uid 977 (searxng).
+      # fsGroup 977 → l'emptyDir /etc/searxng est accessible en écriture par l'init + le main.
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 977
+        runAsGroup: 977
+        fsGroup: 977
+        seccompProfile:
+          type: RuntimeDefault
+      # Copie settings.yml (ConfigMap RO) dans un emptyDir inscriptible → évite les soucis
+      # de mount RO de l'entrypoint searxng (chown/sed éventuels sur le fichier de conf).
+      initContainers:
+        - name: copy-config
+          image: docker.io/searxng/searxng:2026.6.22-952896d29
+          command: ["sh", "-c", "cp /config-src/settings.yml /etc/searxng/settings.yml"]
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop: ["ALL"]
+          volumeMounts:
+            - name: config-src
+              mountPath: /config-src
+              readOnly: true
+            - name: config
+              mountPath: /etc/searxng
+      containers:
+        - name: searxng
+          image: docker.io/searxng/searxng:2026.6.22-952896d29
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop: ["ALL"]
+          ports:
+            - containerPort: 8080
+          env:
+            # Base URL interne (pas d'exposition WAN). Requis par SearXNG pour générer ses liens.
+            - name: SEARXNG_BASE_URL
+              value: "http://searxng.lab.local/"
+          volumeMounts:
+            - name: config
+              mountPath: /etc/searxng
+          readinessProbe:
+            tcpSocket:
+              port: 8080
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          livenessProbe:
+            tcpSocket:
+              port: 8080
+            initialDelaySeconds: 15
+            periodSeconds: 20
+          resources:
+            requests:
+              cpu: 100m
+              memory: 192Mi
+            limits:
+              cpu: "1"
+              memory: 512Mi
+      volumes:
+        - name: config-src
+          configMap:
+            name: searxng-settings
+        - name: config
+          emptyDir: {}