fix(schema): place x-enumNames on enum schema instead of DTO property

[maruthang]

Summary

Fixes #3391

Bug: x-enumNames (and description) were incorrectly placed on the shared enum schema object rather than staying on the DTO property reference.

Root Cause: createEnumSchemaType() in SchemaObjectFactory copied description from DTO property metadata onto the shared enum schema object. Since description is per-property, not per-type, it caused x-enumNames and description to bleed onto the wrong schema.

Fix: Removed the single line description: metadata.description ?? undefined from the enum schema creation block in createEnumSchemaType().

Changes

• lib/services/schema-object-factory.ts: Removed erroneous description copy from DTO property metadata into the shared enum schema object
• e2e/api-spec.json: Updated E2E snapshot to reflect corrected schema (description no longer appears on enum schema)
• test/services/schema-object-factory.spec.ts: Added 3 regression tests verifying correct placement of x-enumNames, that description is not copied to enum schema, and that x-enumNames is placed correctly on a pre-existing enum schema

Testing

• Added 3 regression tests in test/services/schema-object-factory.spec.ts that verify correct x-enumNames placement and that description is not copied to the enum schema
• All existing tests pass (161 passing)