veeso / wasm-dbms / 23753459382

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feat: add #[unique] attribute for table fields

Add support for the #[unique] field attribute that enforces uniqueness
constraints on non-primary-key columns. A unique field automatically
gets a B+ tree index for efficient O(log n) duplicate detection.

- Parse #[unique] in Table derive macro, set ColumnDef::unique and
  auto-generate an index for the field
- Add UniqueConstraintViolation error variant to QueryError
- Enforce uniqueness in InsertIntegrityValidator and
  UpdateIntegrityValidator (update allows keeping own value)
- Add comprehensive tests for insert, update, and transaction scenarios
- Update schema, errors, and IC reference documentation

Closes #63

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