security: let database permissions override code-level AllowAnonymous

[ktsapo]

Summary

• Remove early return for IAllowAnonymous in SheshaAuthorizationFilter so authorization helpers always run
• In ApiAuthorizationHelper, instead of returning early for [AllowAnonymous] attributes, pass AllowAnonymous as the replaceInherited fallback
• This means: if a DB record has an explicit access level (Disable, RequiresPermissions, AnyAuthenticated), the DB wins; if no DB override exists (Inherited), the code attribute is respected

Test plan

• Verify endpoints with [AllowAnonymous] and no DB override still work anonymously
• Verify endpoints with [AllowAnonymous] but a DB override of RequiresPermissions require the configured permission
• Verify endpoints with [AllowAnonymous] but a DB override of Disable return 404

Closes #4621

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📥 Commits

Reviewing files that changed from the base of the PR and between e6a4084 and 6651639.

📒 Files selected for processing (2)

• shesha-core/src/Shesha.Application/Authorization/ApiAuthorizationHelper.cs
• shesha-core/src/Shesha.Application/Authorization/SheshaAuthorizationFilter.cs

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