Harden v2 schema hashing: capture more schema detail and fix determin…

[zachtbeer]

What changed

Hardened the v2 schema hash so it stops missing real schema changes and stops producing different hashes for the same schema on different machines.

Schema details it now actually hashes (these used to slip through as identical):

• Computed column formulas and whether they're persisted
• Filtered index WHERE predicates
• Foreign key referenced table and column
• Default constraint target column
• Index key sort order (ASC/DESC) and INCLUDE columns

Determinism fixes:

• All sorting is ordinal now, so the hash doesn't depend on machine culture
• Ints are serialized little-endian explicitly instead of host byte order
• Identity detection works for table names with dots
• Uses HASHBYTES on Azure SQL instead of falling back to weak CHECKSUM
• ObjectNamesToIgnore now filters UDTs too, not just tables and procs

Options:

• Added V1, V2, and Structural presets (V2 is the new Default)
• Added IgnoreIndexNames, IgnoreIndexSortOrder, and IgnoreSysDiagramObjects toggles