Fix UNIQUE indexes on JSON properties with -> operator

[Copilot]

• Fix parser to allow VALUE keyword after -> operator
• Fix parser to allow VALUE keyword in JSON object literals
• Fix CREATE UNIQUE INDEX to register unique indexes in table.uk
• Add comprehensive test coverage (test925.test.js)
• Verify all tests pass

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[mathiasrw]

@copilot why is there no files being changed in this PR?

[Copilot]

@copilot why is there no files being changed in this PR?

The changes are now committed in 10314d5. The previous commit attempt failed to push, so I've recreated all the changes:

Files changed:

• src/alasqlparser.jison - Added VALUE keyword support after -> operator and in JSON literals
• src/alasqlparser.js - Regenerated parser from jison
• src/65createindex.js - Fixed CREATE UNIQUE INDEX to register in table.uk array
• test/test925.test.js - Added comprehensive test coverage
• yarn.lock - Dependencies

All tests pass including the new test925.test.js which verifies unique indexes work correctly with JSON properties.