fix: use IPv4 address in healthcheck to fix Traefik detection

The healthcheck was using localhost which resolves to IPv6 [::1],
but Next.js only listens on IPv4. Changed to 127.0.0.1.
Also removed deprecated 'version' key from docker-compose.yml.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   mycrozine-web:
     build:
@@ -29,7 +27,7 @@ services:
     networks:
       - traefik-public
     healthcheck:
-      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:3000/"]
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1:3000/"]
       interval: 30s
       timeout: 10s
       retries: 3