fix(seo): website/koja base URL defaulted to localhost → de-indexed in GSC

Production serves robots.txt Host/Sitemap, sitemap <loc>, and every page's
canonical + og:url as http://localhost:3010 — so Google rejects all URLs
("URL not allowed") and indexes nothing. Cause: NEXT_PUBLIC_SITE_URL is baked in
at BUILD time and was unset in prod, so it fell back to the localhost defaults in
the compose files + website Dockerfile.

Changes the defaults to the real domains (website → https://meezi.ir, koja →
https://koja.meezi.ir) in docker-compose.yml, docker-compose.full.yml, the
website Dockerfile ARG, and .env.example.

Build-time var → the website image MUST be rebuilt + redeployed (CI does this on
push), then purge the WCDN cache and resubmit the sitemap in Search Console.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose.full.yml

@@ -168,7 +168,7 @@ services:
       dockerfile: docker/website/Dockerfile
       args:
         MEEZI_API_URL: http://api:8080
-        NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-http://localhost:3010}
+        NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-https://meezi.ir}
     container_name: meezi-website
     restart: unless-stopped
     depends_on:
@@ -178,7 +178,7 @@ services:
       PORT: "3000"
       HOSTNAME: 0.0.0.0
       MEEZI_API_URL: http://api:8080
-      NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-http://localhost:3010}
+      NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-https://meezi.ir}
     ports:
       - "${WEBSITE_PORT:-3010}:3000"