feat: Refactor build and service logic

Updated package.json scripts to use Vite for development and building, removing esbuild dependency.
Migrated Gemini AI service logic from a backend API to direct integration using the Google GenAI library. This centralizes AI analysis within the application, improving performance and maintainability.

package.json

@@ -4,9 +4,8 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "tsx server.ts",
-    "build": "vite build && esbuild server.ts --bundle --platform=node --format=cjs --packages=external --sourcemap --outfile=dist/server.cjs",
-    "start": "node dist/server.cjs",
+    "dev": "vite --port=3000 --host=0.0.0.0",
+    "build": "vite build",
     "preview": "vite preview",
     "clean": "rm -rf dist",
     "lint": "tsc --noEmit"
@@ -40,7 +39,6 @@
     "@types/express": "^4.17.21",
     "@types/node": "^22.14.0",
     "autoprefixer": "^10.4.21",
-    "esbuild": "^0.28.0",
     "eslint": "^10.2.1",
     "tailwindcss": "^4.1.14",
     "ts-node": "^10.9.2",