fix(orm): resolve basedpyright errors in ORM config and connections

[tmgbedu]

Summary

Batch 13 of the basedpyright cleanup (task #1916). Fixes the errors in masoniteorm/config/, masoniteorm/connections/ and masoniteorm/testing/transaction.py. It doesn't touch the Morph relationships, models/registry.py, schema/Blueprint.py or any file in the open PRs (#170, #196, #220, #222, #235).

basedpyright: 195 → 178 errors, no new errors.

Changes

• config/config.py: DB_URL, DB_PASSWORD and DB_SOCKET are now read with cast=False, so they stay str.
• config/database.py: connections is typed as the config dataclasses or a dict, and migrations as dict[str, str]. These are annotation-only changes.
• connections/connection.py: get_query_grammar and get_post_processor are now typed @classmethods, matching the driver overrides. They still return None.
• connections/{sqlite,mysql,postgres}_connection.py: added return annotations.
• connections/factory.py, testing/transaction.py: cast("Application", app()) before calling methods that only exist on Application. str() the migrations path, which Migrator already stringifies internally.

Behavior changes

• Connection.select() now returns a list of plain dicts instead of SQLAlchemy RowMappings, which matches its declared list[dict] and select_one(). A regression test is included.
• Env values like DB_PASSWORD=1234 are no longer auto-cast to int in the pydantic config dataclasses. Before, an all-digit password was cast to int, which the str field doesn't accept.

Testing

• uv run basedpyright: 195 → 178, zero new diagnostics
• uv run pytest --ignore=tests/masoniteorm/postgres: 2396 passed, 7 skipped
• ruff check / ruff format --check: clean

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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