feat: Add JWT authentication to backend, configure frontend API client, fix streak layout

src/app/dashboard/streaks/page.tsx

@@ -1,5 +1,6 @@
 "use client"
 
+import { fetchWithAuth } from "@/lib/apiClient";
 import { useState, useEffect } from "react"
 import { Card, CardContent } from "@/components/ui/card"
 import { Flame, Gift, Star, Trophy, Target, ArrowRight, CheckCircle2 } from "lucide-react"
@@ -20,7 +21,7 @@ export default function StreaksPage() {
     }
     async function loadStats() {
       try {
-        const res = await fetch(`/api/users/${user?.id}/stats`)
+        const res = await fetchWithAuth(`/api/users/${user?.id}/stats`)
         if (res.ok) {
           const stats = await res.json()
           if (!stats.is_new_user) {