List Vaults by combination of external keys with optional user identifier and pagination

This endpoint allows filtering vaults by a combination of external keys with optional user identification and cursor-based pagination.

Key Features:

• Filter vaults by multiple external key-value pairs (AND operation)
• Optional user identification via userId, federationId, or invitationCode
• Cursor-based pagination with limit, startingAfter, and endingBefore parameters
• Fallback to tenant-wide vault listing when no identifier provided
• Supports complex filtering scenarios for multi-dimensional vault organization

Pagination Parameters:

• limit: Number of results per page (default: 20, max: 100)
• startingAfter: Object ID to start pagination after (for next page)
• endingBefore: Object ID to end pagination before (for previous page)

Response Format:

      {
        "data": [.], // Array of vault objects
        "hasMore": true, // Whether more results are available
        "totalCount": 150 // Total number of matching vaults (when available)
      }

Use Cases:

1. Department & Region Filtering: Find all finance department vaults in the north region with pagination
2. User-Specific Filtering: Get vaults for a specific user that match certain criteria
3. Invitation-Based Access: Filter vaults accessible via invitation codes
4. Federation Integration: Access vaults through federated identity systems
5. Tenant-Wide Search: Search all tenant vaults with specific external key combinations

External Keys Logic:

• All provided external key filters must match (AND operation)
• Each vault's external keys are checked against the filter criteria
• Empty external keys array returns all vaults (no filtering applied)

User Identification Priority:

1. If federationId provided: Resolves to OpenID or treats as invitationCode
2. If userId provided: Direct user vault lookup
3. If invitationCode provided: Invitation-based vault access
4. If none provided: Tenant-wide vault search

Pagination Notes:

• Filing cabinet fallback scenarios may not support full pagination
• When falling back to filing cabinets, results are aggregated and pagination is limited