fix(gateway): avoid /start crash when config is a GatewayConfig

[stablegenius49]

What does this PR do?

Fixes the Telegram /start crash reported in #973 by making gateway quick-command handling work with the GatewayConfig object used at runtime.

The gateway runner was treating self.config like a plain dict (self.config.get(...)), but the installed gateway path passes a GatewayConfig dataclass. That raised AttributeError: 'GatewayConfig' object has no attribute 'get' before the normal /start flow could continue.

Related Issue

Fixes #973

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• Added quick_commands to gateway/config.py so gateway config loading preserves the configured quick-command map.
• Updated GatewayRunner._handle_message() to support both dict configs (existing tests) and GatewayConfig objects (real runtime path).
• Added a regression test covering GatewayConfig-backed quick commands in tests/test_quick_commands.py.

How to Test

1. Create a Python 3.11 venv and install dev deps (python3.11 -m venv .venv && source .venv/bin/activate && pip install -e '.[dev]').
2. Run python -m pytest -o addopts='' tests/test_quick_commands.py.
3. Configure a Telegram gateway and send /start; it should no longer raise GatewayConfig has no attribute 'get'.

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: macOS 15.4.1 / Python 3.11.15

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

Screenshots / Logs

• python -m pytest -o addopts='' tests/test_quick_commands.py → 12 passed