chore: housekeeping — linter & formatter setup

Add .prettierrc.json, .markdownlint.json, .yamllint.yaml, .gitattributes
Run CSharpier, Prettier and markdownlint across the entire codebase.
No logic changes — formatting, using order and line endings only.

HellionChat/GameFunctions/Party.cs

@@ -1,8 +1,8 @@
-using HellionChat.Resources;
-using HellionChat.Util;
 using Dalamud.Interface.ImGuiNotification;
 using FFXIVClientStructs.FFXIV.Client.UI.Agent;
 using FFXIVClientStructs.FFXIV.Client.UI.Info;
+using HellionChat.Resources;
+using HellionChat.Util;
 
 namespace HellionChat.GameFunctions;
 
@@ -11,7 +11,8 @@ internal static unsafe class Party
     internal static void InviteSameWorld(string name, ushort world, ulong contentId)
     {
         // this only works if target is on the same world
-        fixed (byte* namePtr = name.ToTerminatedBytes()) {
+        fixed (byte* namePtr = name.ToTerminatedBytes())
+        {
             InfoProxyPartyInvite.Instance()->InviteToParty(contentId, namePtr, world);
         }
     }
@@ -44,14 +45,16 @@ internal static unsafe class Party
 
     internal static void Kick(string name, ulong contentId)
     {
-        fixed (byte* namePtr = name.ToTerminatedBytes()) {
+        fixed (byte* namePtr = name.ToTerminatedBytes())
+        {
             AgentPartyMember.Instance()->Kick(namePtr, 0, contentId);
         }
     }
 
     internal static void Promote(string name, ulong contentId)
     {
-        fixed (byte* namePtr = name.ToTerminatedBytes()) {
+        fixed (byte* namePtr = name.ToTerminatedBytes())
+        {
             AgentPartyMember.Instance()->Promote(namePtr, 0, contentId);
         }
     }