Server 2.10.4: HTTPS for the web panel and hostile client hardening

- Panel over HTTPS on the game port (TLS handshake detected like HTTP); self-signed
  certificate in data/panel_cert.pfx (fingerprint in the log) or an own PFX
  (PanelCertificatePath); remote HTTP is redirected to HTTPS (not locally / behind
  a proxy); cookie Secure over HTTPS; PanelHttps=false turns it off
- Panel login: also locked per user name (16 failures / 15 min), failure lists
  bounded, user names in the log without control characters
- panel_users.json, panel_sessions.json, server.json, certificate: owner-only on Linux
- Players: names/chat without control or direction characters (no fake log lines),
  no '<' '>' in names; '* ' system-style chat, msco.* messages (time/weather) and
  MSCO_INSTALL only from admins; NaN/absurd money changes dropped (could break the
  shared money for good)
- Extra headers: Permissions-Policy, Cross-Origin-Opener-Policy
- 11 new tests (165 pass)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

WorldState.cs

@@ -158,7 +158,9 @@ public sealed class WorldState
     {
         ChangesSinceSave++;
         if (payload.Length < 4) return;
-        MoneyDelta += BitConverter.ToSingle(payload, 0);
+        float delta = BitConverter.ToSingle(payload, 0);
+        if (!float.IsFinite(delta)) return;
+        MoneyDelta += delta;
         Dirty = true;
     }