feat: Implement pricing page, AI generation/transformation APIs, user/project management, and database schema.

prisma/schema.prisma

@@ -7,16 +7,38 @@ generator client {
 }
 
 // =====================
-// AUTH
+// AUTH & SUBSCRIPTIONS
 // =====================
+model Plan {
+  id           String   @id // e.g., 'free', 'pro', 'master'
+  name         String   @unique
+  displayName  String
+  price        Float
+  description  String
+  maxProjects  Int      // -1 for unlimited
+  maxAiActions Int      // -1 for unlimited
+  features     String[]
+  isPopular    Boolean  @default(false)
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+
+  users        User[]
+}
+
 model User {
   id             String   @id @default(cuid())
   name           String?
   email          String   @unique
   hashedPassword String
-  avatar         String?
   bio            String?
-  plan           String   @default("free") // free | pro | master
+  
+  // Legacy string plan (temporarily kept to avoid DB drop errors)
+  plan           String   @default("free")
+
+  // New Subscription
+  planId         String?  @default("free")
+  subscriptionPlan Plan?  @relation(fields: [planId], references: [id])
+  
   aiActionsUsed  Int      @default(0)
   dailyWordGoal  Int      @default(500)
   writingStreak  Int      @default(0)

prisma/seed.ts

@@ -0,0 +1,64 @@
+import { config } from 'dotenv';
+config({ path: '.env.local' });
+import getDB from '../src/lib/prisma';
+
+const prisma = getDB();
+
+async function main() {
+    console.log('Seeding plans...');
+
+    const plans = [
+        {
+            id: 'free',
+            name: 'free',
+            displayName: 'Gratuit',
+            price: 0,
+            description: 'Idéal pour découvrir PlumeIA.',
+            maxProjects: 1,
+            maxAiActions: 10,
+            features: ['10 actions IA / mois', '1 projet actif', 'Bible du monde simple'],
+            isPopular: false,
+        },
+        {
+            id: 'pro',
+            name: 'pro',
+            displayName: 'Auteur Pro',
+            price: 12,
+            description: 'Pour les écrivains sérieux.',
+            maxProjects: -1, // -1 means unlimited
+            maxAiActions: 500,
+            features: ['500 actions IA / mois', 'Projets illimités', 'Export Word & EPUB', 'Support prioritaire'],
+            isPopular: true,
+        },
+        {
+            id: 'master',
+            name: 'master',
+            displayName: 'Maître Plume',
+            price: 29,
+            description: 'Le summum de l\'écriture IA.',
+            maxProjects: -1,
+            maxAiActions: -1, // -1 means unlimited
+            features: ['Actions IA illimitées', 'Accès Gemini 3 Pro', 'Bible du monde avancée', 'Outils de révision avancés'],
+            isPopular: false,
+        },
+    ];
+
+    for (const plan of plans) {
+        await prisma.plan.upsert({
+            where: { id: plan.id },
+            update: plan,
+            create: plan,
+        });
+    }
+
+    console.log('Plans seeded successfully.');
+}
+
+main()
+    .catch((e) => {
+        console.error(e);
+        process.exit(1);
+    })
+    .finally(async () => {
+        await prisma.$disconnect();
+    });