fix(ci): use editable install + ignore live tests at collection

[victalejo]

Summary

The CI workflow added in # failed on every test job with
ModuleNotFoundError: No module named 'pyquotex'. Three root causes,
all fixed here:

1. Build backend was broken. pyproject.toml mixed PEP 621
   [project] with legacy [tool.poetry] fields (packages = [...],
   [tool.poetry] include = ...). With poetry-core>=2.0 this combo
   fails metadata generation: tool.poetry.dependencies must be object.
   So pip install -e . couldn't work at all — neither locally nor on CI.

2. CI never installed the package. The workflow used
   pip install -r requirements.txt, which pulls runtime deps but does
   not put pyquotex/ on sys.path. Tests imported from pyquotex.…
   and crashed at collection.

3. Legacy live tests blocked collection. tests/test_basic.py
   (and 8 others) call credentials() at module import time, which
   does input("Enter your account email: ") when settings/config.ini
   is absent. On CI stdin is closed, so pytest aborted with
   OSError: reading from stdin while output is captured — before
   the live-test skip marker could fire.

Changes

• pyproject.toml — migrated to hatchling as the build backend.
  Cleaned legacy [tool.poetry] cruft. Added test and dev
  optional-dependency extras. Kept the existing ruff/pytest config.
  Wheel still ships py.typed (verified by python -m build).

• tests/conftest.py — added pytest_ignore_collect that drops
  the legacy live test modules from the collection phase entirely
  when PYQUOTEX_LIVE is unset. They're still discoverable / runnable
  with PYQUOTEX_LIVE=1 pytest.

• .github/workflows/ci.yml — replaced
  pip install -r requirements.txt … with pip install -e ".[test]"
  in both the type-check and test jobs. Same change makes the
  install path the same one a downstream user would take, validating
  the package is publishable.

Test plan

Locally, from a clean venv:

python -m venv .venv && . .venv/bin/activate
pip install -e ".[test]"
ruff check pyquotex tests scripts
mypy --ignore-missing-imports --no-strict-optional \
  pyquotex/types.py pyquotex/utils/streaming_indicators.py \
  pyquotex/utils/cache.py pyquotex/utils/json_utils.py \
  pyquotex/_api/_waits.py
pytest -q --cov=pyquotex

Result on this branch:

=== RUFF ===   All checks passed!
=== MYPY ===   Success: no issues found in 5 source files
=== PYTEST === 108 passed in 2.95s  (coverage 41%)