fix: support Python 3.14 local setup

[suguanYang]

Summary

• remove the Python <3.14 project upper bound so the README Python 3.11+ setup guidance is accurate
• bump the Python 3.14-blocking runtime pins: asyncpg, psycopg2-binary, pydantic, and pydantic-settings
• refresh uv.lock and the checked-in worker requirements export with Python 3.14-compatible resolution data

Closes #68.

Verification

• uv sync --all-packages --python 3.14
• uv run --python 3.14 pytest apps/worker/tests/contract/test_parse_task_contract.py -q
• uv run --python 3.14 pytest apps/worker/tests/contract -q
• uv run --python 3.14 pytest apps/api/tests/contract -q
• uv run --python 3.14 --group lint ruff check
• uv run --python 3.14 pyright
• uv lock --locked
• git diff --check
• codex review --uncommitted --title "Support Python 3.14 dependency compatibility"