Fix PostgreSQL query placeholders and console type imports

[dfeen87]

Motivation

• Ensure PostgreSQL usage via psycopg receives correctly formatted parameter placeholders when shared SQLite-style ? queries are reused.
• Prevent runtime NameError in Streamlit helpers by adding the missing typing names used in nested helper annotations.
• Provide regression coverage for the PostgreSQL code paths to avoid future regressions.

Description

• Add a _postgres_query helper in cura_frame/db.py that converts ? placeholders to psycopg-compatible %s and apply it to execute, fetchone, and fetchall PostgreSQL branches.
• Import from typing import Any, Dict in apps/console_streamlit/app.py to satisfy nested helper annotations used by the Streamlit UI.
• Add a unit test test_postgres_operations_convert_qmark_placeholders to tests/test_console_db_auth.py exercising execute, fetchone, and fetchall against a fake Postgres cursor to verify placeholder conversion and result shaping.

Testing

• Ran pytest -q and confirmed test suite success with 191 passed (warnings shown but unrelated to these changes).
• Ran pytest -q tests/test_console_db_auth.py tests/test_web.py which passed (coverage of the added regression test included).
• Ran ruff check and python -m compileall to validate style/type imports and byte-compile the package, both completed without errors.

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[chatgpt-codex-connector]

Preserve non-placeholder question marks

When a caller submits valid PostgreSQL syntax containing a question mark that is not a qmark binding—such as the JSONB existence expression payload ? 'key'—this unconditional replacement turns the operator into %s, causing psycopg to interpret it as a parameter placeholder and reject or misexecute the query. Translate only actual bind markers, or use dialect-specific query strings, so PostgreSQL operators and question marks in literals/comments remain intact.

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