feat: add API keys schema with Drizzle ORM integration

backend/src/database/schemas/api_keys.ts

@@ -0,0 +1,18 @@
+import { pgTable, varchar, timestamp, uuid, index, boolean } from 'drizzle-orm/pg-core';
+import { users } from './users';
+
+export const apiKeys = pgTable('api_keys', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  userId: uuid('user_id').notNull().references(() => users.uuid, { onDelete: 'cascade' }),
+  keyHash: varchar('key_hash', { length: 128 }).notNull().unique(), // Haché pour la sécurité (SHA-256)
+  name: varchar('name', { length: 128 }).notNull(), // Nom donné par l'utilisateur (ex: "My App")
+  prefix: varchar('prefix', { length: 8 }).notNull(), // Pour identification visuelle (ex: "mg_...")
+  isActive: boolean('is_active').notNull().default(true),
+  lastUsedAt: timestamp('last_used_at', { withTimezone: true }),
+  expiresAt: timestamp('expires_at', { withTimezone: true }),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+  updatedAt: timestamp('updated_at', { withTimezone: true }).notNull().defaultNow(),
+}, (table) => ({
+  userIdIdx: index('api_keys_user_id_idx').on(table.userId),
+  keyHashIdx: index('api_keys_key_hash_idx').on(table.keyHash),
+}));