feat: Add IČO and DIČ fields to companies

- Add ico and dic columns to companies table schema
- Add validation for ico and dic in createCompanySchema and updateCompanySchema
- Update company.service.js to include ico and dic in all CRUD operations
- Include migration file for database changes

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

src/validators/crm.validators.js

@@ -16,6 +16,8 @@ export const createCompanySchema = z.object({
   phone: z.string().max(50).optional(),
   email: z.string().email('Neplatný formát emailu').max(255).optional().or(z.literal('')),
   website: z.string().url('Neplatný formát URL').max(255).optional().or(z.literal('')),
+  ico: z.string().max(20).optional().or(z.literal('')),
+  dic: z.string().max(20).optional().or(z.literal('')),
   status: z.enum(['registered', 'lead', 'customer', 'inactive']).optional(),
 });
 
@@ -29,6 +31,8 @@ export const updateCompanySchema = z.object({
   phone: z.string().max(50).optional(),
   email: z.string().email('Neplatný formát emailu').max(255).optional().or(z.literal('')),
   website: z.string().url('Neplatný formát URL').max(255).optional().or(z.literal('')),
+  ico: z.string().max(20).optional().or(z.literal('').or(z.null())),
+  dic: z.string().max(20).optional().or(z.literal('').or(z.null())),
   status: z.enum(['registered', 'lead', 'customer', 'inactive']).optional(),
 });