clientmod: build without a local Rec Room install

The mod resolves every game-side type at runtime via
AccessTools.TypeByName, so the IL2CPP interop assemblies
(Assembly-CSharp, Photon3Unity3D, UnityEngine.*) in the csproj were
dead references. Dropped them entirely — only MelonLoader's own
DLLs are actually needed at compile time.

tools/build-patcher-zip.ps1 now downloads MelonLoader BEFORE the
dotnet build and points MelonLoaderDir at the extracted contents,
so a fresh contributor checkout builds the patcher zip cold with
no Rec Room install required. (Previously the csproj defaulted
RecRoomDir to a hardcoded user path and failed for anyone else.)

Verified by deleting bin/obj and running the script from scratch
on a machine without RecRoomDir set — produces a 20 MB zip with
the same manifest/DLL/MelonLoader.zip layout as before.

DorkNet.ClientMod/DorkNet.ClientMod.csproj

@@ -12,21 +12,22 @@
   </PropertyGroup>
 
   <!--
-    MelonLoader 0.6.x build of the DorkNet client patches. This is the
-    MelonLoader-targeted twin of DorkNet.ClientPatch (which is a BepInEx
-    plugin). Both apply the same Harmony patches needed for the watch
-    to point at a DorkNet server — Photon AppId override, .rec.net →
-    custom-host URI rewrite, Photon CustomAuth identity injection, TLS
-    trust bypass, Photon region shortcut.
+    MelonLoader 0.6.x build of the DorkNet client patches. Resolves
+    every game-side type at runtime via AccessTools.TypeByName, so
+    Rec Room's IL2CPP-derived interop assemblies (Assembly-CSharp,
+    Photon3Unity3D, UnityEngine.*) are NOT needed at compile time —
+    they would be derivative works of the game anyway, so we never
+    reference them. Only MelonLoader's own DLLs are needed.
 
-    Set MelonLoaderDir to <RecRoomInstall>\MelonLoader. Override on the
-    command line:
-      dotnet build -p:MelonLoaderDir=C:\... -p:Il2CppAssembliesDir=C:\...
+    tools/build-patcher-zip.ps1 downloads the MelonLoader release zip
+    and points MelonLoaderDir at its extracted contents, so a fresh
+    contributor checkout builds without a local Rec Room install.
+
+    To build outside the script (manual dev loop):
+      dotnet build -p:MelonLoaderDir=<path-to-extracted-MelonLoader>
   -->
   <PropertyGroup>
-    <RecRoomDir Condition="'$(RecRoomDir)' == ''">C:\Users\you\Documents\Recnet\dist\RecRoom-Clean-2020.03.10</RecRoomDir>
-    <MelonLoaderDir Condition="'$(MelonLoaderDir)' == ''">$(RecRoomDir)\MelonLoader</MelonLoaderDir>
-    <Il2CppAssembliesDir Condition="'$(Il2CppAssembliesDir)' == ''">$(MelonLoaderDir)\Il2CppAssemblies</Il2CppAssembliesDir>
+    <MelonLoaderDir Condition="'$(MelonLoaderDir)' == ''">$(MSBuildThisFileDirectory)..\build\melonloader</MelonLoaderDir>
   </PropertyGroup>
 
   <ItemGroup>
@@ -46,31 +47,6 @@
       <HintPath>$(MelonLoaderDir)\net6\Il2CppInterop.Common.dll</HintPath>
       <Private>false</Private>
     </Reference>
-
-    <Reference Include="Il2Cppmscorlib">
-      <HintPath>$(Il2CppAssembliesDir)\Il2Cppmscorlib.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
-    <Reference Include="Il2CppSystem">
-      <HintPath>$(Il2CppAssembliesDir)\Il2CppSystem.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
-    <Reference Include="Assembly-CSharp">
-      <HintPath>$(Il2CppAssembliesDir)\Assembly-CSharp.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
-    <Reference Include="Assembly-CSharp-firstpass">
-      <HintPath>$(Il2CppAssembliesDir)\Assembly-CSharp-firstpass.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
-    <Reference Include="Photon3Unity3D">
-      <HintPath>$(Il2CppAssembliesDir)\Photon3Unity3D.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
-    <Reference Include="UnityEngine.CoreModule">
-      <HintPath>$(Il2CppAssembliesDir)\UnityEngine.CoreModule.dll</HintPath>
-      <Private>false</Private>
-    </Reference>
   </ItemGroup>
 
 </Project>