Core API - Integration Metadata & Record Lineage

Summary

Adds new integration metadata endpoints, introduces record_lineage on key Core resources, and expands filtering support with the cont operator.

GET /core/v1/integrations/configurations
- N/A → Available
- Type: addition
- Notes: Lists integration configurations associated with the MSP.
GET /core/v1/integrations/vendors
- N/A → Available
- Type: addition
- Notes: Lists supported integration vendors.
record_lineage (clients, contacts, members, contracts, opportunities)
- Not returned → Returned
- Type: addition
- Notes: Optional field providing source record and integration metadata.
Filtering operator cont
- Not supported → Supported
- Type: behavior-change
- Notes: Enables partial string matching on supported filterable fields. At least three characters required.