Add .mcp.json config and include in solution items

Added .mcp.json to define GitHub server configuration with API URL and authorization header. Updated G4.sln to include .mcp.json as a solution item for better project management.

Author: gravity-api

src/.mcp.json

@@ -0,0 +1,11 @@
+{
+	"servers": {
+		"github": {
+			"type": "http",
+			"url": "https://api.githubcopilot.com/mcp/",
+			"headers": {
+				"Authorization": "Bearer "
+			}
+		}
+	}
+}

src/G4.sln

@@ -31,6 +31,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".docs", ".docs", "{6C196AB2
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".github", ".github", "{AB40C270-E21E-44D5-A50C-1CD5EA778ECC}"
 	ProjectSection(SolutionItems) = preProject
+		.mcp.json = .mcp.json
 		..\.github\workflows\release-pipeline.yml = ..\.github\workflows\release-pipeline.yml
 	EndProjectSection
 EndProject