fix: Add description field to personal contacts

- Add description to Zod validation schema
- Add description to controller normalizePayload function

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/routes/personal-contact.routes.js

@@ -13,6 +13,7 @@ const createContactSchema = z.object({
   email: z.string().email('Neplatný email'),
   secondaryEmail: z.union([z.string().email('Neplatný email'), z.literal('')]).optional(),
   companyId: z.union([z.string().uuid(), z.literal(''), z.null()]).optional(),
+  description: z.union([z.string().max(1000), z.literal(''), z.null()]).optional(),
 })
 
 const updateContactSchema = createContactSchema.partial()