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/EmoteCache.cs

@@ -101,7 +101,10 @@ public static class EmoteCache
                 t =>
                 {
                     if (t.IsFaulted)
-                        Plugin.Log.Error(t.Exception!, $"EmoteCache load failed for {emoteCode}");
+                        Plugin.LogProxy.Error(
+                            t.Exception!,
+                            $"EmoteCache load failed for {emoteCode}"
+                        );
                 },
                 TaskScheduler.Default
             )
@@ -158,7 +161,7 @@ public static class EmoteCache
         {
             // Reset to Unloaded so a later trigger can retry without a plugin reload.
             State = LoadingState.Unloaded;
-            Plugin.Log.Error(ex, "BetterTTV cache wasn't initialized");
+            Plugin.LogProxy.Error(ex, "BetterTTV cache wasn't initialized");
         }
     }
 
@@ -214,7 +217,7 @@ public static class EmoteCache
         }
         catch
         {
-            Plugin.Log.Error("Failed to convert");
+            Plugin.LogProxy.Error("Failed to convert");
             return null;
         }
     }
@@ -304,7 +307,7 @@ public static class EmoteCache
             catch (Exception ex)
             {
                 Failed = true;
-                Plugin.Log.Error(ex, $"Unable to load {emote.Code} with id {emote.Id}");
+                Plugin.LogProxy.Error(ex, $"Unable to load {emote.Code} with id {emote.Id}");
             }
         }
 
@@ -408,7 +411,7 @@ public static class EmoteCache
             catch (Exception ex)
             {
                 Failed = true;
-                Plugin.Log.Error(ex, $"Unable to load {emote.Code} with id {emote.Id}");
+                Plugin.LogProxy.Error(ex, $"Unable to load {emote.Code} with id {emote.Id}");
             }
         }
     }