fix: accept both string and number types for limit parameter

- Change limit schema type from 'number' to ['number', 'string']
- Fixes 400 error when n8n sends limit as string (e.g. "50" instead of 50)
- Service layer already converts with Number() for safety

Author: kelvinzer0

src/validate/business.schema.ts

@@ -4,7 +4,7 @@ export const catalogSchema: JSONSchema7 = {
   type: 'object',
   properties: {
     number: { type: 'string' },
-    limit: { type: 'number' },
+    limit: { type: ['number', 'string'] },
     cursor: { type: 'string' },
   },
 };
@@ -13,7 +13,7 @@ export const collectionsSchema: JSONSchema7 = {
   type: 'object',
   properties: {
     number: { type: 'string' },
-    limit: { type: 'number' },
+    limit: { type: ['number', 'string'] },
     cursor: { type: 'string' },
   },
 };