`fee()` method missing positive integer validation for `job` parameter

[morphqdd]

What happens: The fee() method in lib/baza-rb.rb (lines 457–458) checks that job is not nil and is an Integer, but does not check that it is positive. Calling baza.fee('unknown', 1.0, 'test', -1) passes local validation and sends a negative job ID to the server.

What should happen: fee() should raise an error when job is not positive, consistent with the transfer() method (line 432) which validates unless job.positive?.

[morphqdd]

@yegor256, please take a look when you have a moment.

[0crat]

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