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----
> [!IMPORTANT]
> Refactor tenancy configuration structure, affecting authentication,
email, domain, OAuth, and permissions settings, with updates to feature
flag checks, property access, and test assertions.
>
> - **Refactor**:
> - Updated configuration structure for authentication, email, domain,
OAuth, and permissions settings, affecting feature flag checks and
property access in `handlers.tsx`, `route.tsx`, and `crud.tsx`.
> - Improved handling of domain and OAuth provider configurations for
integrations and CRUD operations.
> - Adjusted redirect URL validation and origin checks to use updated
tenancy configuration.
> - Transformed project and tenancy configuration data returned by API
handlers for consistency.
> - Centralized email theme and template retrieval from updated
configuration paths.
> - **Bug Fixes**:
> - Corrected error messages related to OTP sign-in feature
availability.
> - **Tests**:
> - Updated test assertions to match new error messages for OTP sign-in.
> - **Chores**:
> - Reorganized import statements and updated internal logic to align
with new configuration structure.
>
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=stack-auth%2Fstack-auth&utm_source=github&utm_medium=referral)<sup>
for ae04ae28be. You can
[customize](https://app.ellipsis.dev/stack-auth/settings/summaries) this
summary. It will automatically update as commits are pushed.</sup>
----
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Updated configuration structure for authentication, email, domain,
OAuth, and permissions settings, resulting in changes to feature flag
checks and property access throughout the backend.
* Improved handling of domain and OAuth provider configurations for
integrations and CRUD operations.
* Adjusted redirect URL validation and origin checks to use updated
tenancy configuration.
* Transformed project and tenancy configuration data returned by API
handlers for consistency.
* Centralized email theme and template retrieval from updated
configuration paths.
* Simplified redirect URL validation calls by passing tenancy objects
directly.
* Updated passkey, password, OTP, and OAuth feature flag checks to new
nested configuration properties.
* **Bug Fixes**
* Corrected error messages related to OTP sign-in feature availability.
* **Tests**
* Updated test assertions to match new error messages for OTP sign-in.
* **Chores**
* Reorganized import statements and updated internal logic to align with
new configuration structure.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
- Made S3_REGION optional in the configuration check.
- Updated HAS_S3 condition to include S3_REGION and S3_ENDPOINT.
- Enhanced regex for base64 image validation to allow alphanumeric characters.
