feat(BA-5454): add project-scoped model serving search across all layers

[fregataa]

Summary

• Add ProjectEndpointSearchScope to filter model serving endpoints by project
• Implement search_in_project across repository, service, and processor layers for project-scoped endpoint listing
• Register search_services_in_project processor with RBAC scope validator

Test plan

• Unit tests with real DB: scope filtering, project isolation, pagination fields
• CI lint/type/test checks

Resolves BA-5454

[Copilot]

Pull request overview

Adds a project-scoped model serving endpoint search API path across repository/service/processor layers, with RBAC scope validation for project access.

Changes:

• Introduces ProjectEndpointSearchScope and repository search_in_project for project-filtered endpoint search.
• Adds new SearchServicesInProjectAction and wires it through service + processor with RBAC scope validation.
• Adds unit tests covering project isolation and basic pagination flags.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
tests/unit/manager/repositories/model_serving/test_endpoint_search_in_project.py	Adds repository-level unit tests for project-scoped endpoint search.
src/ai/backend/manager/services/model_serving/services/model_serving.py	Adds service method to expose project-scoped search via the repository.
src/ai/backend/manager/services/model_serving/processors/model_serving.py	Registers new processor action and applies RBAC scope validator.
src/ai/backend/manager/services/model_serving/actions/search_in_project.py	Defines new action + result types for project-scoped search.
src/ai/backend/manager/repositories/model_serving/types.py	Adds ProjectEndpointSearchScope with SQL condition + existence check.
src/ai/backend/manager/repositories/model_serving/repository.py	Implements repository search_in_project returning ServiceSearchResult.
changes/10596.feature.md	Adds changelog entry for the new project-scoped list/search.

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