🏗️ Architect: Refactor Endpoints for SOLID Principles

[fderuiter]

🏗️ Architect: Refactor Endpoint Logic

🏗️ Design Change:

• Moved from a monolithic _list_impl (handling both sync/async via inspect) to explicit _list_sync and _list_async methods in ListGetEndpointMixin.
• Similarly split _get_impl into _get_sync and _get_async.
• Introduced _process_filters hook to allow subclasses to extract parameters without overriding execution logic.

♻️ DRY Gains:

• Centralized execution preparation in _prepare_execution.
• Removed duplicate "is async" checks in JobsEndpoint and RecordsEndpoint.

🛡️ Solidity:

• Decoupled Model parsing from HTTP fetching more clearly.
• Enforced explicit types (List[T] vs Any).
• BaseEndpoint._auto_filter now returns a copy, preventing side effects.

⚠️ Breaking Changes:

• Internal methods _list_impl and _get_impl are removed. Subclasses relying on overriding these (like UsersEndpoint, RecordsEndpoint) have been updated to use _process_filters.
• Unit tests mocking _list_impl were updated to mock _list_sync or _list_async.

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PR created automatically by Jules for task 1845034591522279126 started by @fderuiter

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