Add admin dashboard shell with sidebar navigation and page scaffolds.

Replace the default Next.js landing page with a client-side AppShell layout, placeholder pages for each admin section, and UI utility dependencies.

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

package-lock.json

@@ -8,9 +8,12 @@
       "name": "ai-video-admin-frontend",
       "version": "0.1.0",
       "dependencies": {
+        "clsx": "^2.1.1",
+        "lucide-react": "^1.17.0",
         "next": "16.2.7",
         "react": "19.2.4",
-        "react-dom": "19.2.4"
+        "react-dom": "19.2.4",
+        "tailwind-merge": "^3.6.0"
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
@@ -2771,6 +2774,15 @@
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       "license": "MIT"
     },
+    "node_modules/clsx": {
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+      "resolved": "https://registry.npmjs.org/clsx/-/clsx-2.1.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -5032,6 +5044,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-1.17.0.tgz",
+      "integrity": "sha512-9FA9evdox/JQL5PT57fdA1x/yg8T7knJ98+zjTL3UfKza6pflQUUh3XtaQIHKvnsJw1lmsEyHVlt5jchYxOQ5w==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/magic-string": {
       "version": "0.30.21",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
@@ -6242,6 +6263,16 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/tailwind-merge": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/tailwind-merge/-/tailwind-merge-3.6.0.tgz",
+      "integrity": "sha512-uxL7qAVQriqRQPAyK3pj66VqskWqoZ37PW94jwOTwNfq/z9oyu1V+eqrZqtR2+fCiXdYOZe/Modt8GtvqNzu+w==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/dcastil"
+      }
+    },
     "node_modules/tailwindcss": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.3.0.tgz",