feat: Refactor settings UI and fix commission fee recording

Settings improvements:
- Reorganize config groups with logical ordering (server, auth, ai, trading, etc.)
- Add description/tooltip for each config item with question mark icon
- Add icon to each group header
- Support i18n for descriptions (zh-CN, zh-TW, en-US)
- Move order execution config (ORDER_MODE, MAKER_WAIT_SEC, MAKER_OFFSET_BPS) to env

Commission fee fixes:
- Fix fee extraction in exchange clients: Bybit, Coinbase, Kraken, Gate, Kucoin, Bitfinex
- Properly accumulate and record commission fees in pending_order_worker
- Add fee/fee_ccy fields to wait_for_fill returns

Frontend updates:
- Remove order_mode config from trading-assistant frontend (now uses env config)
- Add sorted schema display by order field
- Add tooltip with description on hover

backend_api_python/app/services/live_trading/bybit.py

@@ -315,12 +315,22 @@ class BybitClient(BaseRestClient):
                 avg_price = float(last.get("avgPrice") or 0.0)
             except Exception:
                 avg_price = 0.0
+            # Extract fee from cumExecFee (Bybit API field for cumulative execution fee)
+            fee = 0.0
+            fee_ccy = ""
+            try:
+                fee = abs(float(last.get("cumExecFee") or 0.0))
+            except Exception:
+                fee = 0.0
+            # Bybit linear contracts are settled in USDT
+            if fee > 0:
+                fee_ccy = "USDT"
             if filled > 0 and avg_price > 0:
-                return {"filled": filled, "avg_price": avg_price, "status": status, "order": last}
+                return {"filled": filled, "avg_price": avg_price, "fee": fee, "fee_ccy": fee_ccy, "status": status, "order": last}
             if status.lower() in ("filled", "cancelled", "canceled", "rejected"):
-                return {"filled": filled, "avg_price": avg_price, "status": status, "order": last}
+                return {"filled": filled, "avg_price": avg_price, "fee": fee, "fee_ccy": fee_ccy, "status": status, "order": last}
             if time.time() >= end_ts:
-                return {"filled": filled, "avg_price": avg_price, "status": status, "order": last}
+                return {"filled": filled, "avg_price": avg_price, "fee": fee, "fee_ccy": fee_ccy, "status": status, "order": last}
             time.sleep(float(poll_interval_sec or 0.5))
 
     def get_positions(self) -> Dict[str, Any]: