Fix jail item loop exploit

[GhzGarage]

Block SaveJailItems and GiveJailItems unless the player is currently jailed (injail > 0), preventing remote event abuse for infinite jail cash.

Summary

Related issue

Change type

• Bug fix
• New feature
• Breaking change
• Documentation
• Refactor, maintenance, or performance improvement

Testing

• FXServer artifact:
• qb-core version or commit:
• Resource version or commit:
• Server operating system:
• Test steps and results:

Compatibility and migration

Screenshots or video

Checklist

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• This pull request contains one focused change and does not include unrelated formatting or refactoring.
• I tested the change on a current FXServer artifact with the relevant official resources and dependencies.
• Existing repository checks and linting pass.
• I documented new behavior and identified every breaking or migration-related change.
• I added or updated configuration examples, SQL migrations, and translations where applicable.
• I removed credentials, webhook URLs, license keys, database data, player identifiers, and other private information.
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