docs: add comprehensive cursor-based pagination guide and endpoint registry

[Adedayo-Data]

Description

Augments the repository documentation by adding an explicit, step-by-step Pagination Guide. This ensures developer integration workflows handle large list datasets efficiently using uniform, cursor-based navigation patterns.

Changes Implemented

• Pagination Guide Section: Detailed the operational parameters (limit, order, and cursor) that govern list evaluation endpoints.
• Cursor Mechanics Walkthrough: Provided an explicit operational breakdown explaining how to extract the nextCursor string attribute from a response metadata payload and feed it into subsequent request parameters.
• Structural Request/Response Example: Illustrated matching JSON envelope schemas for both the initial page execution and the subsequent cursor-driven page transition.
• Paginated Endpoint Registry: Cataloged all active endpoints currently enforcing cursor-based pagination structures:
  • GET /transactions/:id
  • GET /transactions/:id/operations
  • GET /account/:id/payments
  • GET /account/:id/timeline
  • GET /account/:id/transactions/search
  • GET /asset/:code/:issuer/holders

Verification Plan

• Validated markdown lint styling, structural anchor boundaries, and endpoint matching formats.
  closes Pagination Guide for All Paginated Endpoints in README #123

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