Add RBAC endpoint permission matrix documentation

[nanaf6203-bit]

Document role access for protected endpoints.

Acceptance Criteria:

• Permission matrix covers auth, users, properties, transactions, documents, and admin endpoints.
• Document clearly lists role access rights.
• Add the matrix to repo docs or README.
• Review ensures all current endpoints are represented.

[neyij]

@neyij has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hi, i would like to work on this.

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[sandrawillow001-afk]

@sandrawillow001-afk has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

can work on this issue sir

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Congratulations, @sandrawillow001-afk! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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[drips-wave]

This issue has been completed by @sandrawillow001-afk as part of the Stellar Wave Program's 5th Wave 🥳

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