set_privacy` does not consistently require owner authorization for all privacy APIs

[grantfox-oss]

set_privacy` is guarded, but other privacy endpoints and legacy access paths may bypass the same auth semantics. Harden all privacy APIs and tests.

• Impacted files: app/contract/contracts/Folder/src/lib.rs, app/contract/contracts/Folder/src/privacy.rs, app/contract/contracts/Folder/src/storage.rs, app/contract/contracts/Folder/src/test.rs, app/contract/contracts/Folder/src/metadata_test.rs, app/contract/docs/UPGRADE_SAFETY_GATE_TEST_GUIDE.md

[OluRemiFour]

I've reviewed the task and have a clear implementation plan. Looking forward to contributing with a quality PR.

[egwujiohaifesinachiperpetual-max]

Hello boss, Please assign this issue to me. i checked it out and im confident i will solve it
my eta is 4 hours

[A6dulmalik]

I'd like to work on this issue if it's available.

I've gone through the description and understand the expected functionality, edge cases, and testing requirements. I'll implement the solution incrementally, ensure it meets the acceptance criteria, and include the required unit and integration tests before submitting a PR.

Please assign this issue to me if it's available. Looking forward to contributing!

[grantfox-oss]

🦊 GrantFox — @A6dulmalik has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #332)
2. Your PR will be reviewed by the BlockDash-Studios maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@A6dulmalik's PR #344 was approved and merged by @MaryammAli.

🏆 @A6dulmalik: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (942 total points). Track your full progress on GrantFox.

👏 Great work, @A6dulmalik! Keep contributing to BlockDash-Studios.