Align core Python codebase with current Ruff checks to unblock “Python Code Review (Ruff)”

[Copilot]

The Python Code Review (Ruff) Actions job was failing because the repository no longer matched the lint/format expectations of the Ruff version installed in CI. This PR updates the core Python service and tests to satisfy current ruff check and ruff format --check behavior.

• CI failure scope

  • Resolved broad Ruff violations in services/core (imports/order, formatting drift, simplifiable control/context patterns).

• Targeted manual fixes where autofix was insufficient

  • Collapsed nested context managers into multi-context with statements (SIM117).
  • Replaced membership-on-.keys() with direct row access fallback for sqlite3.Row (SIM118/SIM401 compatible behavior).
  • Updated test context-manager __enter__ annotations to Self (PYI034).
  • Kept FastAPI query parameter alias behavior while explicitly suppressing Ruff’s B008 false-positive in endpoint signature.

• Consistency pass

  • Applied Ruff formatting normalization across affected core modules/tests so formatter-check and linter enforce the same baseline going forward.

Example of a representative change:

# before
with self.connect() as connection:
    with connection:
        connection.execute(...)

# after
with self.connect() as connection, connection:
    connection.execute(...)