feat: Fase 1 - Autenticação completa

- Prisma com SQLite configurado
- Tabelas: users, sessions, subscriptions, children, etc
- Auth.js com credentials provider
- API de registro com criação de usuário + criança
- Middleware para proteger rotas
- Login/Cadastro funcionais
- Dashboard com sessão real

public/icon-iristea.svg

@@ -0,0 +1,39 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <defs>
+    <!-- Gradiente arco-íris -->
+    <linearGradient id="rainbow" x1="0%" y1="0%" x2="100%" y2="0%">
+      <stop offset="0%" style="stop-color:#ef4444"/>
+      <stop offset="20%" style="stop-color:#f59e0b"/>
+      <stop offset="40%" style="stop-color:#22c55e"/>
+      <stop offset="60%" style="stop-color:#3b82f6"/>
+      <stop offset="80%" style="stop-color:#8b5cf6"/>
+      <stop offset="100%" style="stop-color:#ec4899"/>
+    </linearGradient>
+    
+    <!-- Gradiente para o olho/íris -->
+    <radialGradient id="irisGrad" cx="50%" cy="50%" r="50%">
+      <stop offset="0%" style="stop-color:#818cf8"/>
+      <stop offset="50%" style="stop-color:#6366f1"/>
+      <stop offset="100%" style="stop-color:#4f46e5"/>
+    </radialGradient>
+  </defs>
+  
+  <!-- Background círculo -->
+  <circle cx="50" cy="50" r="48" fill="white"/>
+  
+  <!-- Arco-íris acima do olho -->
+  <path d="M 12 52 Q 50 10, 88 52" stroke="url(#rainbow)" stroke-width="7" fill="none" stroke-linecap="round"/>
+  
+  <!-- Forma do olho -->
+  <ellipse cx="50" cy="58" rx="35" ry="26" fill="white" stroke="#e5e7eb" stroke-width="2"/>
+  
+  <!-- Íris (parte colorida) -->
+  <circle cx="50" cy="58" r="20" fill="url(#irisGrad)"/>
+  
+  <!-- Pupila -->
+  <circle cx="50" cy="58" r="9" fill="#1e1b4b"/>
+  
+  <!-- Brilho -->
+  <circle cx="44" cy="52" r="4" fill="white" opacity="0.8"/>
+  <circle cx="54" cy="55" r="2" fill="white" opacity="0.6"/>
+</svg>