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/services/trade_service.py

@@ -40,7 +40,9 @@ def _default_dry_run(config: dict[str, Any], dry_run: bool | None) -> bool:
     return bool(config.get("trading", {}).get("dry_run_default", False))
 
 
-def _trade_log_payload(intent: TradeIntent, payload: dict[str, Any], *, status: str, error: str | None = None) -> dict[str, Any]:
+def _trade_log_payload(
+    intent: TradeIntent, payload: dict[str, Any], *, status: str, error: str | None = None
+) -> dict[str, Any]:
     return {
         "market_type": intent.market_type,
         "symbol": intent.symbol,
@@ -125,7 +127,9 @@ def execute_spot_trade(
                 response_payload=response,
             )
         )
-        audit_event("trade_filled", {**_trade_log_payload(intent, payload, status="DRY_RUN"), "response_payload": response})
+        audit_event(
+            "trade_filled", {**_trade_log_payload(intent, payload, status="DRY_RUN"), "response_payload": response}
+        )
         return {"trade": result}
 
     try:
@@ -146,5 +150,7 @@ def execute_spot_trade(
             response_payload=response,
         )
     )
-    audit_event("trade_filled", {**_trade_log_payload(intent, payload, status=result["status"]), "response_payload": response})
+    audit_event(
+        "trade_filled", {**_trade_log_payload(intent, payload, status=result["status"]), "response_payload": response}
+    )
     return {"trade": result}