fix: replace Zod schema with JSON Schema in auth/login to resolve Fastify v5 startup crash

apps/api/src/routes/auth.ts

@@ -8,18 +8,20 @@ export async function authRoutes(fastify: FastifyInstance) {
     // Login with Email/Password
     fastify.post('/login', {
         schema: {
-            body: z.object({
-                email: z.string().email(),
-                password: z.string(),
-                organizationId: z.string().optional() // Optional for super admins, required for others
-            })
+            body: {
+                type: 'object',
+                required: ['email', 'password'],
+                properties: {
+                    email:          { type: 'string', format: 'email' },
+                    password:       { type: 'string' },
+                    organizationId: { type: 'string' }
+                }
+            }
         }
     }, async (request, reply) => {
         const { email, password, organizationId } = request.body as any;
         logger.info(`[AUTH] Login attempt for ${email} (Org: ${organizationId || 'default'})`);
 
-        // If no organizationId provided, we check for Super Admin in 'default-org-id' 
-        // or we need to ask for it.
         const orgId = organizationId || 'default-org-id';
 
         const user = await AuthService.findUserByEmail(email, orgId);
@@ -34,7 +36,6 @@ export async function authRoutes(fastify: FastifyInstance) {
             return reply.code(401).send({ error: 'Unauthorized', message: 'Invalid email or password' });
         }
 
-        // Generate JWT
         const token = fastify.jwt.sign({
             id: user.id,
             organizationId: user.organizationId,