feat: add username availability check API endpoint

feat: create user image retrieval API endpoint

feat: enhance coin page with dynamic data fetching and improved UI

feat: implement coin creation form with validation and submission logic

feat: add user settings page with profile update functionality

website/src/routes/api/portfolio/total/+server.ts

@@ -0,0 +1,62 @@
+import { auth } from '$lib/auth';
+import { error, json } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { user, userPortfolio, coin } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+
+export async function GET({ request }) {
+    const session = await auth.api.getSession({
+        headers: request.headers
+    });
+
+    if (!session?.user) {
+        throw error(401, 'Not authenticated');
+    }
+
+    const userId = Number(session.user.id);
+
+    const [userData] = await db
+        .select({ baseCurrencyBalance: user.baseCurrencyBalance })
+        .from(user)
+        .where(eq(user.id, userId))
+        .limit(1);
+
+    if (!userData) {
+        throw error(404, 'User not found');
+    }
+
+    const holdings = await db
+        .select({
+            quantity: userPortfolio.quantity,
+            currentPrice: coin.currentPrice,
+            symbol: coin.symbol
+        })
+        .from(userPortfolio)
+        .innerJoin(coin, eq(userPortfolio.coinId, coin.id))
+        .where(eq(userPortfolio.userId, userId));
+
+    let totalCoinValue = 0;
+    const coinHoldings = holdings.map(holding => {
+        const quantity = Number(holding.quantity);
+        const price = Number(holding.currentPrice);
+        const value = quantity * price;
+        totalCoinValue += value;
+
+        return {
+            symbol: holding.symbol,
+            quantity,
+            currentPrice: price,
+            value
+        };
+    });
+
+    const baseCurrencyBalance = Number(userData.baseCurrencyBalance);
+
+    return json({
+        baseCurrencyBalance,
+        totalCoinValue,
+        totalValue: baseCurrencyBalance + totalCoinValue,
+        coinHoldings,
+        currency: '$'
+    });
+}