feat: Add Dev Container configuration for a consistent development environment.

.devcontainer/Dockerfile

@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/javascript-node:22-bookworm

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+{
+    "name": "Horror Game Dev",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "dbaeumer.vscode-eslint",
+                "esbenp.prettier-vscode",
+                "slevesque.shader",
+                "circlecode.glsl-literal",
+                "pwn-man.three-js-snippets"
+            ]
+        }
+    },
+    "forwardPorts": [
+        5173
+    ],
+    "postCreateCommand": "npm install",
+    "remoteUser": "node"
+}