fix(oocana): convert CredentialInput to dataclass

[leavesster]

Summary

• Convert CredentialInput class to a frozen dataclass
• Add to __all__ exports
• Add docstring

Problem

CredentialInput was a plain class without standard data structure features:

• No automatic __eq__, __hash__, __repr__
• Not exported in __all__
• Inconsistent with other data classes in the codebase

Solution

from dataclasses import dataclass

__all__ = ["CredentialInput"]

@dataclass(frozen=True)
class CredentialInput:
    """Credential input configuration for authentication."""
    type: str
    id: str

Test Plan

• All existing tests pass
• CredentialInput now supports equality comparison and hashing

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[Copilot]

Pull request overview

Converts CredentialInput into an immutable (frozen) dataclass and makes it an explicit public export.

Changes:

• Replaced the manual CredentialInput class with a @dataclass(frozen=True) version.
• Added module-level __all__ export for CredentialInput.
• Added a class docstring describing purpose and attributes.

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[Copilot]

All other dataclasses in this package are declared with kw_only=True (e.g., oocana/oocana/handle.py:7, oocana/oocana/data.py:41, oocana/oocana/schema.py:38). To keep CredentialInput consistent and avoid accidental positional-argument usage, consider adding kw_only=True here as well.