refactor(services): route logging through IPluginLogProxy

F12.2 step 5b — service cluster (~42 sites in 16 files):
MessageManager, GameFunctions/{Chat, GameFunctions, KeybindManager},
EmoteCache, PayloadHandler, AutoTellTabsService, FontManager, Commands,
Util/{WrapperUtil, AutoTranslate, MemoryUtil}, Message, Themes/ThemeRegistry,
Ipc/ExtraChat, Configuration.

The proxy interface gained Dalamud's params-overload signature
(messageTemplate + params object[]) to cover Configuration.cs:86 which
relies on Serilog-style placeholders.

Verified: zero remaining Plugin.Log.X(...) call-sites in HellionChat/,
build green, build-suite 690/690.

HellionChat/Util/WrapperUtil.cs

@@ -21,12 +21,12 @@ public static class WrapperUtil
     {
         try
         {
-            Plugin.Log.Debug($"Opening URI {uri} in default browser");
+            Plugin.LogProxy.Debug($"Opening URI {uri} in default browser");
             Plugin.PlatformUtil.OpenLink(uri.ToString());
         }
         catch (Exception ex)
         {
-            Plugin.Log.Error($"Error opening URI: {ex}");
+            Plugin.LogProxy.Error($"Error opening URI: {ex}");
             AddNotification(Language.Context_OpenInBrowserError, NotificationType.Error);
         }
     }