refactor: replace external Python scripts and batch files with new Unity Editor C# utilities and a Python server project.

Author: choej2303

MCPForUnity/Editor/Dependencies/DependencyManager.cs

@@ -118,7 +118,7 @@ private static DependencyCheckResult CheckAllDependenciesInternal(DependencyCont
                          Version = isServerReady ? "Installed" : "Missing",
                          IsAvailable = isServerReady,
                          Details = isServerReady ? "Virtual Environment Ready" : "Run 'Install Server Environment'",
-                         ErrorMessage = "Virtual environment not set up"
+                         ErrorMessage = isServerReady ? null : "Virtual environment not set up"
                      });
                 }
                 catch (Exception ex)

MCPForUnity/Editor/Helpers/AssetPathUtility.cs

@@ -140,10 +140,11 @@ public static string GetWrapperJsPath()
             }
 
             // Also check without the ~ just in case
-            string wrapperPathNoTilde = Path.Combine(Path.GetDirectoryName(wrapperPath), "Server", "wrapper.js");
+            // Also check without the ~ just in case
+            string wrapperPathNoTilde = Path.Combine(Path.GetDirectoryName(wrapperPath), "..", "Server", "wrapper.js");
             if (File.Exists(wrapperPathNoTilde))
             {
-                return wrapperPathNoTilde;
+                return Path.GetFullPath(wrapperPathNoTilde);
             }
 
             return null;

MCPForUnity/Editor/Helpers/ConfigJsonBuilder.cs

@@ -139,11 +139,14 @@ private static void PopulateUnityNode(JObject unity, string uvPath, McpClient cl
             }
 
             // Force UTF-8 environment variables for Python Stdio stability
-            // This is crucial when running via uvx without a wrapper to prevent "invalid trailing data" errors
-            var env = EnsureObject(unity, "env");
-            env["PYTHONUTF8"] = "1";
-            env["PYTHONIOENCODING"] = "utf-8";
-            env["PYTHONUNBUFFERED"] = "1";
+            // (only meaningful when we're launching a process, i.e., stdio mode)
+            if (!useHttpTransport)
+            {
+                var env = EnsureObject(unity, "env");
+                env["PYTHONUTF8"] = "1";
+                env["PYTHONIOENCODING"] = "utf-8";
+                env["PYTHONUNBUFFERED"] = "1";
+            }
 
             bool requiresEnv = client?.EnsureEnvObject == true;
             bool stripEnv = client?.StripEnvWhenNotRequired == true;

MCPForUnity/Server~/pyproject.toml

@@ -20,7 +20,10 @@ dev = [
 ]
 
 [project.scripts]
-mcp-for-unity = "main:main"
+mcp-for-unity = "src.main:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
 
 [build-system]
 requires = ["setuptools>=80.9.0", "wheel>=0.45.1"]