feat: update environment variables for development and production; add user store and authentication client

- Updated VITE_API_URL in .env.development to point to local server.
- Retained VITE_API_URL in .env.production for production use.
- Added user store for managing user profile and authentication state.
- Created authentication client for handling user login and token management.
- Introduced safeClient utility for making API requests with error handling.
- Updated various components and views to utilize new user store and authentication logic.
- Enhanced UI styles for better visual consistency across the application.

src/views/auth/login.vue

@@ -1,7 +1,5 @@
 <script lang='ts' setup>
-import { ref } from "vue";
-import { useRouter } from "vue-router";
-
+const route = useRoute();
 const router = useRouter();
 
 const phoneNumber = ref("");
@@ -23,7 +21,7 @@ function handleLogin() {
 }
 
 function handleSignup() {
-  router.push("/auth/signup");
+  router.push(`/auth/signup?redirect=${encodeURIComponent(route.query.redirect as string || "/")}`);
 }
 
 function goToTerms(type: "service" | "privacy") {