refactor(infra) : reorganize docker config into infra/dev and infra/prod

Align project structure with Lesstime: move docker/ to infra/dev/ and
deploy/ to infra/prod/. Update all references in docker-compose,
makefile, CI workflow, Dockerfile, .gitignore and .dockerignore.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-docker.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Build Docker image
         run: |
           docker build \
-            -f deploy/docker/Dockerfile.prod \
+            -f infra/prod/Dockerfile \
             -t gitea.malio.fr/malio-dev/inventory:${{ gitea.ref_name }} \
             -t gitea.malio.fr/malio-dev/inventory:latest \
             .