Optimize atheme services resource allocation to 512MB

- Reduce atheme from 1GB to 512MB RAM
- Atheme services are lightweight (NickServ, ChanServ, etc.) with external PostgreSQL
- No local database overhead, just IRC service processes and PostgreSQL client connections
- Final allocation: 9RL=1GB (hub), 1EU=512MB (leaf), atheme=512MB (services)
- Provides cost-effective resource allocation matched to actual workload requirements

Author: perigrin

servers/magnet-atheme/fly.toml

@@ -5,7 +5,7 @@ app = "magnet-atheme"
 primary_region = "ord"
 
 [vm]
-  memory = "1gb"
+  memory = "512mb"
   cpus = 1
 
 [build]

t/00-infrastructure.t

@@ -24,7 +24,7 @@ my %EXPECTED_APPS = (
     },
     'magnet-atheme' => {
         region => 'ord',
-        memory => '1gb',
+        memory => '512mb',
         cpus => 1,
         volume_size => 3,
         ports => [8080],