Add endpoint for retrieving available project resources

[mxsrc]

Introduce an endpoint to check a project's available resources. The endpoint is embedded in the regular endpoint hierarchy and uses newly introduced helpers for computation because the existing logic is convoluted and resists incremental change. The idea is to replace it eventually by the new approach that uses dedicated abstractions for handling resource computations.

[Copilot]

Pull request overview

Adds a new set of resource “limits / allocations / available” endpoints (system-, organization-, and project-scoped) backed by newly introduced helper dataclasses and computation helpers in the resource-limit utility layer.

Changes:

• Introduces Limits/Resources dataclasses and new system_* / organization_* / project_* helper functions for resource computations.
• Adds new REST endpoints under /resources, /organizations/{org_id}/resources, and /organizations/{org_id}/projects/{project_id}/resources.
• Adds a Project.storage_enabled async property to conditionally hide storage_size in some project resource responses.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
src/api/_util/resourcelimit.py	Adds Limits/Resources abstractions and new system/org/project limit/allocation/available helpers.
src/api/resources.py	Renames router to api and adds system-level /resources/{limits,allocations,available} endpoints.
src/api/organization/resources.py	Adds organization-scoped /resources/{limits,allocations,available} endpoints plus limit updates.
src/api/organization/project/resources.py	Adds project-scoped /resources/{limits,allocations,available} endpoints plus limit updates and conditional storage field exclusion.
src/api/organization/project/init.py	Wires the new project resources router and modifies project persistence during creation.
src/api/organization/init.py	Wires the new organization resources router.
src/api/init.py	Wires the (renamed) top-level resources router.
src/models/project.py	Adds an async storage_enabled property based on presence of storage limits.
src/_util/init.py	Adds empty() and single_or_none() helpers used by new resource computations.

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