fix(supabase): use internal URL for all server-side clients with cookie name matching

ROOT CAUSE FIX: All server-side Supabase clients (server-client, middleware-client,
server-admin-client) now use SUPABASE_INTERNAL_URL (http://supabase-kong:8000)
when available, with cookieOptions.name set to match the external URL's cookie key
(e.g. sb-myeasycms-auth-token). This gives us:
- Reliable Docker-internal networking (no hairpin NAT through Traefik)
- Correct session cookie matching between browser and server
- No more 500 errors on SSR pages that query Supabase

Reverted per-page try/catch workarounds since root cause is now fixed.

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 # --- Install + Build in one stage ---
 FROM base AS builder
 # CACHE_BUST: change this value to force a full rebuild (busts Docker layer cache)
-ARG CACHE_BUST=13
+ARG CACHE_BUST=14
 RUN echo "Cache bust: ${CACHE_BUST}"
 COPY . .
 RUN pnpm install --no-frozen-lockfile