refactor(stt): pivot client-serveur — STT-server in-cluster + client pipx

Sépare STT en deux :
- stt/client/ : commande `stt` (pipx), voix locale (Whisper/Piper) + HUD ; envoie
  le texte au serveur via api.py (ServerClient → POST /v1/ask). URL serveur paramétrable,
  pas de cerveau local (suppression du routeur 3 modes).
- stt/server/ : STT-server FastAPI (conteneur), /healthz + /v1/ask → LiteLLM (Qwen3/Claude).

Déploiement cluster :
- k8s/apps/stt/ : Deployment, Service, IngressRoute (stt.lab.local), litellm-ext
  (Service + Endpoints → 192.168.10.1:4000 pour joindre LiteLLM hors cluster)
- k8s/apps-of-apps/apps/stt.yaml : Application ArgoCD (depuis main)
- .github/workflows/build-stt-server.yml : build/push image → ghcr.io/alkatrazz24/funk-stt-server

Inférence/chat seulement (outils Hermes 'agir sur Funk' = phase ultérieure, API :8080 à spécifier).
Vérifié : py_compile client+serveur, YAML manifests, ServerClient.

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

.github/workflows/build-stt-server.yml

@@ -0,0 +1,46 @@
+name: build-stt-server
+
+# Construit et pousse l'image du STT-server vers ghcr.io quand stt/server/ change.
+on:
+  push:
+    branches: ["main", "claude/**"]
+    paths:
+      - "stt/server/**"
+      - ".github/workflows/build-stt-server.yml"
+  workflow_dispatch:
+
+env:
+  IMAGE: ghcr.io/alkatrazz24/funk-stt-server
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Metadata (tags)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha,format=short
+
+      - name: Build & push
+        uses: docker/build-push-action@v6
+        with:
+          context: stt/server
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}