refactor: remove biome configuration and update dependencies

- Deleted the obsolete biome.json file to streamline project configuration.
- Updated package.json and bun.lock to include new ESLint and Prettier dependencies for improved code quality and consistency.
- Added ESLint configuration package for better linting support across the project.
- Cleaned up various package dependencies to ensure a more maintainable and efficient codebase.

package.json

@@ -10,7 +10,9 @@
     "catalog": {
       "convex": "^1.28.0",
       "typescript": "^5.9.2",
-      "better-auth": "1.3.27"
+      "better-auth": "1.3.27",
+      "eslint": "^9.39.1",
+      "@eslint/js": "^9.39.1"
     }
   },
   "scripts": {
@@ -24,13 +26,20 @@
     "dev:setup": "turbo -F @sgse-app/backend dev:setup"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.3.2",
-    "turbo": "^2.5.8"
+    "eslint": "^9.39.1",
+    "globals": "^16.5.0",
+    "jiti": "^2.6.1",
+    "turbo": "^2.5.8",
+    "typescript-eslint": "^8.46.3",
+    "prettier": "^3.6.2",
+    "eslint-plugin-svelte": "^3.13.0",
+    "prettier-plugin-tailwindcss": "^0.7.1"
   },
   "dependencies": {
     "@tanstack/svelte-form": "^1.23.8",
     "chart.js": "^4.5.1",
     "lucide-svelte": "^0.552.0",
+    "prettier-plugin-svelte": "^3.4.0",
     "svelte-chartjs": "^3.1.5",
     "svelte-sonner": "^1.0.5"
   },