feat: add catlog command, agent flag reorder, and TUI polish

- Add `coinhunter catlog` with limit/offset pagination for audit logs
- Optimize audit log reading with deque to avoid loading all history
- Allow `-a/--agent` flag after subcommands
- Fix upgrade spinner artifact and empty line issues
- Render audit log TUI as timeline with low-saturation event colors
- Convert audit timestamps to local timezone in TUI
- Remove futures-related capabilities
- Add conda environment.yml for development
- Bump version to 2.0.9 and update README

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/coinhunter/binance/spot_client.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from collections.abc import Callable
 from typing import Any
 
-from requests.exceptions import RequestException, SSLError
+from requests.exceptions import RequestException, SSLError  # type: ignore[import-untyped]
 
 
 class SpotBinanceClient: