fix: Add GitHub authentication cell for private repo

- Add cell 1 for token input (getpass)
- Update clone command to use token from environment
- Now 3 cells: auth, setup, start

Unsloth_Studio_Colab.ipynb

@@ -11,8 +11,13 @@
     "# Setup: Clone repo and build frontend\n",
     "# ===========================================\n",
     "\n",
-    "# Clone repository\n",
-    "!git clone https://github.com/unslothai/new-ui-prototype.git\n",
+    "# Clone repository with GitHub token\n",
+    "import os\n",
+    "github_token = os.environ.get('GITHUB_TOKEN', '')\n",
+    "if github_token:\n",
+    "    !git clone https://{github_token}@github.com/unslothai/new-ui-prototype.git\n",
+    "else:\n",
+    "    !git clone https://github.com/unslothai/new-ui-prototype.git\n",
     "%cd /content/new-ui-prototype\n",
     "\n",
     "# Install Node.js 20.x\n",
@@ -34,6 +39,29 @@
     "print(\"✅ Python dependencies installed\")"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "26b0e164",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# ===========================================\n",
+    "# GitHub Authentication (Private Repo)\n",
+    "# ===========================================\n",
+    "from getpass import getpass\n",
+    "import os\n",
+    "\n",
+    "print(\"🔐 GitHub Token Required\")\n",
+    "print(\"Get token: https://github.com/settings/tokens\")\n",
+    "print(\"Scope needed: 'repo'\")\n",
+    "print(\"-\" * 50)\n",
+    "\n",
+    "github_token = getpass(\"Enter GitHub Token: \")\n",
+    "os.environ['GITHUB_TOKEN'] = github_token\n",
+    "print(\"✅ Token stored\")"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,