feat: Initial Diabetix application commit

- Add authentication with NextAuth v5 (credentials + email verification)
- Implement dashboard with glycemia tracking and AI analysis
- Add PDF report generation for Premium users
- Implement Stripe integration for Premium subscriptions
- Add responsive UI with Tailwind CSS and shadcn components
- Database schema with Prisma ORM and PostgreSQL support
- Real-time glycemia visualization with Recharts
- Mobile-optimized entry form
- User profile management with medical information
- Subscription lifecycle management (create, cancel, webhook)
- Email notifications with Resend
- Feature gates for Free vs Premium plans

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

prisma/schema.prisma

@@ -0,0 +1,90 @@
+generator client {
+  provider = "prisma-client-js"
+  output   = "../src/generated/prisma"
+}
+
+datasource db {
+  provider = "sqlite"
+}
+
+// ─── Auth ────────────────────────────────────────────────────────────────────
+
+model User {
+  id            String    @id @default(cuid())
+  email         String    @unique
+  emailVerified DateTime?
+  name          String
+  passwordHash  String
+  plan          String    @default("FREE")  // FREE | PREMIUM
+  stripeId      String?   @unique
+  createdAt     DateTime  @default(now())
+  updatedAt     DateTime  @updatedAt
+
+  readings       Reading[]
+  patient        Patient?
+  dailyAnalysis  DailyAnalysis?
+  verifyTokens   VerifyToken[]
+  subscription   Subscription?
+}
+
+model VerifyToken {
+  id        String   @id @default(cuid())
+  token     String   @unique
+  userId    String
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  expiresAt DateTime
+  createdAt DateTime @default(now())
+}
+
+// ─── Domain ──────────────────────────────────────────────────────────────────
+
+model Reading {
+  id         Int      @id @default(autoincrement())
+  userId     String
+  user       User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  measuredAt DateTime
+  moment     String
+  value      Float
+  notes      String?
+  createdAt  DateTime @default(now())
+
+  @@index([userId, measuredAt])
+}
+
+model Patient {
+  id            String    @id @default(cuid())
+  userId        String    @unique
+  user          User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  firstName     String
+  lastName      String
+  email         String?
+  birthDate     DateTime?
+  heightCm      Int?
+  weightKg      Float?
+  sex           String?
+  diabetesType  String?
+  treatment     String?
+  updatedAt     DateTime  @updatedAt
+}
+
+model DailyAnalysis {
+  id          String   @id @default(cuid())
+  userId      String   @unique
+  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  content     String
+  generatedAt DateTime @default(now())
+}
+
+model Subscription {
+  id                String   @id @default(cuid())
+  userId            String   @unique
+  user              User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  stripeId          String   @unique
+  stripePriceId     String
+  stripeCustomerId  String
+  status            String   // active | past_due | canceled | unpaid
+  currentPeriodEnd  DateTime
+  canceledAt        DateTime?
+  createdAt         DateTime @default(now())
+  updatedAt         DateTime  @updatedAt
+}