feat(server): add optional provider_id reference to contexts

[jezekra1]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @jezekra1, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement to the context management system by allowing contexts to be optionally linked to a specific provider. This enables better organization and filtering of contexts based on their origin or associated service, improving the overall flexibility and utility of the context feature. The changes span the entire stack, from the database schema and API to the SDK and comprehensive testing.

Highlights

• Context Model Enhancement: The Context model across the SDK, API schema, and domain now includes an optional provider_id field, allowing contexts to be associated with a specific provider.
• API and SDK Updates: The Context.create and Context.list methods in the Python SDK, as well as the corresponding API endpoints (/api/v1/contexts for POST and GET), have been updated to support the new optional provider_id parameter for creation and filtering.
• Database Migration: A new Alembic migration script has been added to introduce a nullable provider_id column to the contexts table, with a foreign key constraint linking it to the providers table and configured for cascading deletes.
• Service and Repository Logic: The service and persistence layers have been updated to handle the provider_id during context creation and to enable filtering contexts by provider_id when listing them.
• End-to-End Testing: New end-to-end tests have been added to validate the functionality of creating contexts with and without provider_id and to ensure correct filtering of contexts based on the provider_id.

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[gemini-code-assist]

Code Review

This pull request introduces an optional provider_id to the context model and related functionalities. This allows contexts to be associated with specific providers, enabling filtering and better organization of contexts. The changes include modifications to the data models, API schemas, service layer, persistence layer, and e2e tests to accommodate the new provider_id field. I have identified a few areas where improvements can be made to ensure code quality and clarity.

[gemini-code-assist]

Consider using Optional[str] instead of str | None for better readability and consistency with other type hints in this file.

Suggested change

	provider_id: str | None = None,
	provider_id: typing.Optional[str] = None,

[jezekra1]

tell me, where else in this file is Optional type hint?