RegWatch frontend : React/Vite -> nginx + Docker/CI homelab

- URL d'API externalisée (VITE_API_URL bakée au build), plus de localhost en dur
- Dockerfile multi-stage pnpm build -> nginx (fallback SPA)
- docker-compose (Watchtower) + .gitea/workflows/build.yml

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,15 @@
+services:
+  regwatch-frontend:
+    image: git.nfteam.ovh/mouigni/regwatch-frontend:latest
+    container_name: regwatch-frontend
+    restart: unless-stopped
+    pull_policy: always
+    ports:
+      - "8115:80"
+    labels:
+      - "com.centurylinklabs.watchtower.enable=true"
+      - "homepage.group=RegWatch"
+      - "homepage.name=RegWatch"
+      - "homepage.icon=mdi-radar"
+      - "homepage.href=https://regwatch.nfteam.ovh"
+      - "homepage.description=Veille réglementaire (front React/Vite)"