Reduce volume sizes for IRC services to optimize costs

[perigrin]

Problem

Both IRC service volumes are significantly over-provisioned:

• magnet-9rl (Solanum IRCd): Currently 3GB, needs ~256-512MB
• magnet-atheme (IRC services): Currently 3GB, needs ~512MB-1GB

Current Usage Analysis

Solanum IRCd (magnet-9rl):

• Config files: <1MB
• Log files: ~10-50MB/month with rotation
• Ban database: ~1-10MB
• SSL certs: <1MB
• Recommended: 512MB (generous with room for growth)

Atheme Services (magnet-atheme):

• User/channel database: 50-100MB for small network
• Memos and logs: ~50-100MB
• Configuration: <1MB
• Recommended: 1GB (allows for network growth)

Cost Impact

• Current: 6GB total storage
• Proposed: 1.5GB total storage
• Savings: ~75% reduction in storage costs

Implementation Plan

1. Create new smaller volumes
2. Migrate data from existing volumes
3. Update fly.toml configurations
4. Remove old oversized volumes

Files to Update

Priority: Medium (cost optimization, no functional impact)