* feat: add builds concurrency management for servers
- Introduced a new `BuildsConcurrency` component to manage the number of concurrent builds for both local and remote servers, gated by license validity.
- Implemented backend logic to resolve effective builds concurrency based on server settings and organization licenses.
- Added unit tests for concurrency resolution logic to ensure correct behavior under various licensing scenarios.
- Updated database schema to include `buildsConcurrency` field for servers and web server settings.
- Refactored deployment queue to support in-memory job processing with configurable concurrency limits.
This feature enhances deployment flexibility and control for enterprise users.
* refactor: enhance deployment cancellation logic and improve Railpack build isolation
- Reintroduced the `initCancelDeployments` function in the server initialization sequence to ensure deployments can be canceled effectively.
- Updated the Railpack build command to use a unique builder name for each build, preventing conflicts during concurrent deployments.
- Enhanced the cancellation logic to reset application and compose statuses to "idle" after canceling running deployments, improving system reliability.
* test: add buildsConcurrency setting to server configuration tests
- Introduced a new `buildsConcurrency` property in the server configuration tests to ensure proper handling of concurrent builds in deployment scenarios.
* feat: implement builds concurrency management and validation
- Added `assertBuildsConcurrencyAllowed` function to validate concurrency settings based on license status.
- Updated `resolveBuildsConcurrency` to reflect new concurrency limits for free and enterprise tiers.
- Enhanced `BuildsConcurrency` component to manage concurrent builds for servers, with UI adjustments for better user experience.
- Introduced a new settings page for managing concurrent builds across servers, ensuring proper handling of deployments.
- Updated database schema to support increased maximum concurrency values for servers and web server settings.
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