feat(pagination): implement PDO offset pagination runtime

[Maatify]

Motivation

• Implement the owner-approved PDO offset pagination runtime to provide a standalone, PDO-based pagination component matching the package contract and blueprint.
• Remove duplication of pagination mechanics across host projects by centralizing page/per-page normalization, deterministic sorting, typed PDO binding, count validation, and row mapping.
• Preserve existing ordering behavior and package boundaries by adding a new Pagination domain without modifying Ordering, tests, docs, or composer configuration.

Description

• Add seven pagination runtime classes under src/Pdo/Pagination: PageRequest, SortDirectionEnum, SortWhitelist, PaginationConfig, PdoPaginationQueryDescriptor, PageResult, and PdoPaginator, implementing normalization, whitelist quoting, descriptor validation, count execution, ORDER BY + tie-breaker assembly, typed binding, fetch/mapping, and PageResult invariants.
• Add three package exceptions under src/Exception: InvalidPaginationConfigurationException, InvalidPaginationQueryException, and PaginationExecutionException, each following the existing package exception pattern and implementing PersistenceException.
• Implement conservative descriptor and parameter validation (no SQL parsing), strict count cardinality and representation checks, named-placeholder typed bindValue() usage, zero-result and overflow behavior, and the exact paginate() execution flow as specified by the blueprint/contract.
• No other files were modified, no new interfaces/traits were introduced, and no public API changes were made beyond the contract-defined additions.

Testing

• Ran php -l against the 10 added files and received "No syntax errors detected" for all files.
• Ran composer analyse which failed in this environment because the phpstan binary is not available (phpstan: not found).
• Ran composer test which failed in this environment because the phpunit binary is not available (phpunit: not found).
• Implementation started from local HEAD 5de52190625f22e42e41d88621276c4a090de0be and the change was committed as HEAD 96b10c46d57173d3b3347db5d66bdb28e1b42393.

---

Codex Task