feat: load login infos from configuration file

[ymarcon]

No description provided.

[Copilot]

Pull request overview

This PR introduces YAML-based configuration loading for DataSHIELD login information, moving login/config structures to Pydantic models and wiring config discovery into the login builder.

Changes:

• Add DSConfig / refactor DSLoginInfo to Pydantic models, with YAML load_from_file() and default-path load() discovery/merge.
• Extend DSLoginBuilder to optionally pre-populate logins from configuration by server name; switch failure output from print to logging.
• Add pytest coverage for YAML parsing/validation and update docs + dependencies/version.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
datashield/interface.py	Adds Pydantic models and YAML config loading/merging via default config file search paths.
datashield/api.py	Allows DSLoginBuilder to load named servers from config; uses logging for connection failure reporting.
tests/test_config.py	New tests covering YAML config parsing and Pydantic validation behaviors.
README.md	Documents config search paths, merge behavior, and YAML schema.
pyproject.toml	Bumps version to 0.3.0 and adds pydantic + PyYAML dependencies.
uv.lock	Updates lockfile to include new runtime dependencies.
datashield/__init__.py	Exposes DSConfig from the package top-level.

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