refactor : reorganize infra files into infra/dev and infra/prod

Consolidate Docker, Nginx, and deploy configs from 5 scattered directories
(docker/, deploy/docker/, deploy/nginx/, script/) into a single infra/ tree
with dev/ and prod/ subdirectories. Update all references in docker-compose,
Makefile, CI workflows, Dockerfiles, and documentation.

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

infra/prod/docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+  app:
+    image: gitea.malio.fr/malio-dev/lesstime:${LESSTIME_IMAGE_TAG:-latest}
+    container_name: lesstime-app
+    env_file: .env
+    ports:
+      - "8081:80"
+    volumes:
+      - ./config/jwt:/var/www/html/config/jwt:ro
+      - ./uploads:/var/www/html/var/uploads
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    restart: unless-stopped