Fix lots of bugs

[alexchandel]

Hey, I don't expect you to merge this as I bumped to Python 3.14 for better syntax, but I've fixed a bunch of things you might want to know about and extract.

Bugs fixed:

• Fixed Jet 3 jump-table offsets across null fields and 256-byte boundaries, preventing bogus memo/LVAL pointers.
• Fixed Jet 3 LVPROP name decoding, eliminating repeated MSysObjects parsing errors.
• Corrected Access GUID byte order; returns UUID.
• Corrected OLE Date/Time handling; returns datetime.
• Currency and Numeric/Decimal now return exact Decimal values.
• Fixed null fixed-length field decoding.
• Fixed primary keys referencing non-contiguous column IDs.

QOL improvements:

• Added query-only, in-memory SQLite adapter with safe identifier quoting.

Regression testing:

• Added broad pytest regression test coverage for test.mdb, type decoding, malformed inputs, and schema metadata.

Type annotations and cleanup:

• Added strict Ruff, Pyright, and ty compliance with typed Construct boundaries.
• Added SQLite/type documentation.

Other (enabling the above):

• Modernized packaging to pyproject.toml/uv with a src layout, locked dependencies.

Fixes #34, #37, I think #31, and probably others.