fix(stt): securityContext conforme PodSecurity restricted (ns ai)

runAsNonRoot + runAsUser 1000 + seccompProfile RuntimeDefault (pod),
allowPrivilegeEscalation false + drop ALL caps (conteneur).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013FmcxGsyXZXogiAHQLjnZT

k8s/apps/stt/deployment.yaml

@@ -17,9 +17,19 @@ spec:
       # (cf. README : kubectl create secret docker-registry ghcr-pull ...)
       imagePullSecrets:
         - name: ghcr-pull
+      # Conformité PodSecurity "restricted" (namespace ai)
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 1000
+        seccompProfile:
+          type: RuntimeDefault
       containers:
         - name: stt-server
           image: ghcr.io/alkatrazz24/funk-stt-server:latest
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop: ["ALL"]
           ports:
             - containerPort: 8000
           env: