Harden auth, payments, and frontend against review findings.

Close exploitable gaps in booking/payment flows, enforce token versioning and account checks, gate sensitive payment data, and add middleware plus input validation across admin routes.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/db/schema.ts

@@ -18,6 +18,8 @@ export const sqliteUsers = sqliteTable('users', {
   googleId: text('google_id'),
   rucNumber: text('ruc_number'),
   accountStatus: text('account_status', { enum: ['active', 'unclaimed', 'suspended'] }).notNull().default('active'),
+  // Incremented to invalidate previously issued JWTs (logout-everywhere, password change/reset)
+  tokenVersion: integer('token_version').notNull().default(0),
   createdAt: text('created_at').notNull(),
   updatedAt: text('updated_at').notNull(),
 });
@@ -359,6 +361,8 @@ export const pgUsers = pgTable('users', {
   googleId: varchar('google_id', { length: 255 }),
   rucNumber: varchar('ruc_number', { length: 15 }),
   accountStatus: varchar('account_status', { length: 20 }).notNull().default('active'),
+  // Incremented to invalidate previously issued JWTs (logout-everywhere, password change/reset)
+  tokenVersion: pgInteger('token_version').notNull().default(0),
   createdAt: timestamp('created_at').notNull(),
   updatedAt: timestamp('updated_at').notNull(),
 });