feat: Add core VN system scripts, package dependencies, and initial project settings.

Packages/packages-lock.json

@@ -1,5 +1,14 @@
 {
   "dependencies": {
+    "com.cysharp.r3": {
+      "version": "https://github.com/Cysharp/R3.git?path=src/R3.Unity/Assets/R3.Unity",
+      "depth": 0,
+      "source": "git",
+      "dependencies": {
+        "com.unity.modules.imgui": "1.0.0"
+      },
+      "hash": "24d04125d68719816e24dfb79c60dd97ca396038"
+    },
     "com.cysharp.unitask": {
       "version": "https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask",
       "depth": 0,
@@ -7,6 +16,13 @@
       "dependencies": {},
       "hash": "73a63b7f672b88f7e9992f6917eb458a8cbb6fa9"
     },
+    "com.github-glitchenzo.nugetforunity": {
+      "version": "https://github.com/GlitchEnzo/NuGetForUnity.git?path=/src/NuGetForUnity",
+      "depth": 0,
+      "source": "git",
+      "dependencies": {},
+      "hash": "34432703a177c97631a4eb1d908f086037c67969"
+    },
     "com.heavycaffiner.ide.vscodeuniversal": {
       "version": "https://github.com/heavycaffeiner/Unity-VSC-OSS-Editor.git",
       "depth": 0,