Cross-server network: shared economy groups for balances and guild banks

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

panel/web/src/components/ServerForm.svelte

@@ -23,6 +23,7 @@
   label="Live Map"
   help="The SCOPENET plugin/mod sends this server's chunks and player positions to the panel, which hosts a Vantage 3D map. Launchers show a Live Map button — nothing to run next to the server."
 />
+<label class="field">Shared economy group<input bind:value={draft.economy_group} maxlength="32" placeholder="Leave empty for a separate economy" /><span class="tiny muted">Servers with the same group name share player balances and guild banks, so one wallet follows players across your network. Existing per-server balances aren't merged.</span></label>
 <details class="adv">
   <summary>Use an external Vantage map instead</summary>
   <label class="field">Vantage manifest URL<input type="url" bind:value={draft.map_url} placeholder="https://maps.example.com/world.json" /><span class="tiny muted">Optional and only used when Live Map above is off. The URL is visible to launcher users.</span></label>