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feat: Implement backtest source management and enhance candle data handling

Changes:
- Introduced a new function `_apply_backtest_source_env_from_request` to manage the environment variables for candle, tick, and order book sources based on incoming requests.
- Added a teardown function `_teardown_backtest_source_env` to ensure that environment variables do not persist between requests, enhancing the stability of the backtesting environment.
- Refactored existing code to utilize the new source management functions, improving code readability and maintainability.
- Added new utility functions in `bt_candle_source.py` for fetching and managing candle data, ensuring consistency with live trading data sources.

Impact:
- These changes improve the flexibility and reliability of the backtesting framework, allowing for better management of data sources and reducing the risk of cross-request contamination.

kis_trader/backtest/trade_orderbook_enrich.py

@@ -126,6 +126,10 @@ def _row_to_ob(
     else:
         verdict = "BODY"  # 주기 스냅 — 판정 메타 없음 (매도도 본체 위주)
     near_only = int(delta_sec) > _STRICT_DELTA_SEC
+    # ratio = L3 매수/매도 잔량비, or_ratio = 전체 잔량비
+    # mid_ratio/whale_ratio = 웹 표(M/W) 호환 별칭 (동일 값)
+    ratio_r = round(ratio, 3) if ratio is not None else None
+    or_r_r = round(or_r, 3) if or_r is not None else None
     return {
         "side": side,
         "snap_time": str(row.get("snap_time") or "")[:14],
@@ -136,10 +140,12 @@ def _row_to_ob(
         "spread_pct": round(_spread_pct(bid, ask) or 0.0, 3),
         "bid_qty_l3": bid_l3,
         "ask_qty_l3": ask_l3,
-        "ratio": round(ratio, 3) if ratio is not None else None,
+        "ratio": ratio_r,
+        "mid_ratio": ratio_r,
         "total_bid_qty": tot_bid,
         "total_ask_qty": tot_ask,
-        "or_ratio": round(or_r, 3) if or_r is not None else None,
+        "or_ratio": or_r_r,
+        "whale_ratio": or_r_r,
         "reject_code": rej,
         "reject_msg": msg,
         "verdict": verdict,