Fix pytest discovery for tests directory

[hhhxxw]

Summary

• Update pytest.ini so pytest discovers both tests/ and the legacy test/ directory.
• Refresh tests/README.md to match the current test layout and commands.
• Remove references to missing test files and document the existing test files.

Verification

• Ran pytest collection from the repository root with the Poetry environment.
• Confirmed 28 tests are collected from both tests/ and test/.
• Ran git diff --check.

[gemini-code-assist]

Code Review

This pull request updates the test configuration and documentation to integrate a legacy test/ directory alongside the main tests/ suite. Key changes include modifying pytest.ini for broader test discovery and extensively updating tests/README.md with modern execution commands and Poetry-based dependency instructions. Feedback focused on correcting relative paths in documentation examples, avoiding hardcoded tool versions, and maintaining consistency by using Poetry for server execution.

[gemini-code-assist]

When running from the repository root, the paths to the test directories should be tests and test relative to the current directory. Using ../ would incorrectly point to directories outside the project root.

Suggested change

	poetry -C api run python -m pytest ../tests ../test
	poetry -C api run python -m pytest tests test

[gemini-code-assist]

Hardcoding a specific version of Poetry (2.0.1) is restrictive. It is generally better to recommend installing the latest version or a version range (e.g., poetry>=2.0.0) to ensure compatibility with the project's configuration while allowing for updates.

Suggested change

	python -m pip install poetry==2.0.1
	python -m pip install poetry

[gemini-code-assist]

For consistency with the rest of the documentation and to ensure the correct virtual environment is used, this command should be run via Poetry.

Suggested change

	python -m api.main
	poetry -C api run python -m api.main