… macOS dylib versioning

Add stoolap_tx_stmt_exec and stoolap_tx_stmt_query FFI functions for executing
prepared statements within transactions, fixing batch insert atomicity. Update
benchmark_ffi.c to use the new API. Add Transaction::query_prepared and
Statement::ast_statement to the Rust API. Set macOS dylib current_version and
compatibility_version in build.rs. Add PHP driver documentation page and update
driver references across README and docs. Update API reference with
query_prepared method and improved pre-parsed statement examples.

…server docs

- Route SELECT queries in the programmatic Transaction API through the full
  Executor pipeline instead of a hand-rolled simple scan
- Enables aggregates, GROUP BY, JOINs, window functions, CTEs, and subqueries
  within transactions
- Add `install_transaction` and `take_transaction` methods to Executor
- Add MCP server documentation page covering all 30 tools, configuration,
  usage examples, and safety measures

…ojection compilation

- Strip table alias prefix from QualifiedIdentifier output column names
  in post-aggregation expressions (u.username -> username)
- Handle window functions in view execution by materializing view rows
  and delegating to execute_select_with_window_functions
- Replace .expect() panics in ExprMappedResult::with_defaults and
  FilteredResult::with_defaults with proper Result propagation

…, add sql-reference resource to MCP docs

… ffi