fix(open-api): remove incorrect uuid format from pageInfo cursor fields

https://sonarly.com/issue/30216?type=bug

The OpenAPI specification for all list endpoints incorrectly declares `startCursor` and `endCursor` in `pageInfo` as `format: 'uuid'`, but the actual API returns base64-encoded JSON strings. This causes client code generators and validation tools to reject valid API responses.

Fix: Removed the incorrect `format: 'uuid'` annotation from `startCursor` and `endCursor` fields in the OpenAPI response schema definitions. The fix touches two functions in `responses.utils.ts`:

1. **`getFindManyResponse200`** (line 35-42): Changed cursor fields from `{ type: 'string', format: 'uuid' }` to `{ type: 'string' }`. This affects the OpenAPI spec for all list/findMany endpoints.

2. **`getFindDuplicatesResponse200`** (line 417-424): Same change for the findDuplicates endpoint response schema.

The actual API returns base64-encoded JSON cursors (e.g., `eyJpZCI6IjQ4MTQ4MjhhLWM3ZWEtNGVhZi04YmIxLThhODg2NmI0MWY4MiJ9`), not UUIDs. The `format: 'uuid'` was incorrectly added in commit c55dfbde6e during an OpenAPI cleanup — likely because the cursor's inner JSON payload contains a UUID, but the cursor string itself is a base64 wrapper. This mismatch caused client code generators and validation tools to reject valid API responses.

packages/twenty-server/src/engine/core-modules/open-api/utils/responses.utils.ts

@@ -32,14 +32,8 @@ export const getFindManyResponse200 = (
               type: 'object',
               properties: {
                 hasNextPage: { type: 'boolean' },
-                startCursor: {
-                  type: 'string',
-                  format: 'uuid',
-                },
-                endCursor: {
-                  type: 'string',
-                  format: 'uuid',
-                },
+                startCursor: { type: 'string' },
+                endCursor: { type: 'string' },
               },
             },
             ...(!fromMetadata && {
@@ -414,14 +408,8 @@ export const getFindDuplicatesResponse200 = (
                     type: 'object',
                     properties: {
                       hasNextPage: { type: 'boolean' },
-                      startCursor: {
-                        type: 'string',
-                        format: 'uuid',
-                      },
-                      endCursor: {
-                        type: 'string',
-                        format: 'uuid',
-                      },
+                      startCursor: { type: 'string' },
+                      endCursor: { type: 'string' },
                     },
                   },
                   [`${item.nameSingular}Duplicates`]: {