v0.0.46: fix group calls, admin commands, ETH in members

Server:
- POST /v1/groups/:name/signal — broadcast plaintext JSON to all
  online group members via WS push (for call signals, typing, etc.)
- No auth required (membership validated from 'from' field)

Web client:
- Group call signals now use /signal endpoint (was broken with /send)
- WS handler detects group_call JSON signals early
- Auto-join #ops now properly registers presence + fetches members
- /gmembers resolves ETH addresses via /v1/resolve
- /admin-calls — list all active calls in the system
- /admin-help — list all admin/debug commands

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.45"
+version = "0.0.46"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"