chore(security): ignore local mcp.json configs

.cursor/mcp.json и .mcp.json в gitignore; убраны из индекса; example без секрета.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/mcp.json.example

@@ -0,0 +1,20 @@
+{
+  "mcpServers": {
+    "codegraph": {
+      "type": "stdio",
+      "command": "codegraph",
+      "args": [
+        "serve",
+        "--mcp",
+        "--path",
+        "C:\\Users\\shats\\Dev\\EvoBGP"
+      ]
+    },
+    "reui": {
+      "url": "https://mcp.reui.io",
+      "headers": {
+        "Authorization": "Bearer <REUI_LICENSE_KEY>"
+      }
+    }
+  }
+}