deps: replace psycopg2-binary with psycopg2

[PeakPy]

This PR addresses the PostgreSQL dependency part of issue #248 by replacing psycopg2-binary with the recommended psycopg2 package.

Changes:

• Remove psycopg2-binary from project dependencies in pyproject.toml.
• Add psycopg2>=2.9.9 as the production-safe PostgreSQL driver.
• Update uv.lock accordingly.

Rationale:

• psycopg2-binary is not recommended for production use.
• The project already uses asyncpg for async access; psycopg2 is only needed for sync tooling (e.g. tests, create_engine).

Tests:

• uv run pytest
• uv run ruff check src
• uv run mypy src