Add empty test level and Unreal MCP tooling

- L_TestFlight: empty, zero-gravity level for Phase 0 flight testing,
  set as editor/game default map.
- Enable UnrealMCPython + Python Editor Script Plugin, third-party
  MCP plugin (GenOrca/unreal-mcp v2.2.0) giving direct editor control
  (actors, blueprints, levels, materials, etc.) alongside Epic's
  built-in Unreal MCP plugin.
- Vendor the mcp-server Python source used to bridge to the plugin.
- .mcp.json intentionally gitignored (machine-specific absolute paths).

mcp-server/pyproject.toml

@@ -0,0 +1,34 @@
+[build-system]
+requires = ["setuptools>=42", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "unrealmcp"
+version = "2.2.0"
+description = "MCP Server for Unreal Engine integration"
+authors = [
+    {name = "Jinhyung Ahn", email = "zenoengine@gmail.com"}
+]
+readme = "README.md"
+requires-python = ">=3.11"
+license = "Apache-2.0"
+dependencies = [
+    "fastmcp",
+]
+
+[project.scripts]
+unrealmcp = "unreal_mcp.main:main"
+
+[project.optional-dependencies]
+dev = [
+    "pytest",
+]
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]