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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/param_search_optuna.py

@@ -772,7 +772,7 @@ def main() -> None:
     parser.add_argument(
         "--candle-source", default="", choices=["", "kis", "kiwoom"],
         dest="candle_source",
-        help="캔들 소스 필터 (기본 빈문자열 = kis)",
+        help="캔들 소스: 빈값=실매 LIVE_TICK_PROVIDER 우선 병합, kis|kiwoom=단일 소스",
     )
     parser.add_argument(
         "--tick-source", default="", choices=["", "kis", "kiwoom"],
@@ -802,6 +802,13 @@ def main() -> None:
     )
     args = parser.parse_args()
 
+    if getattr(args, "candle_source", ""):
+        os.environ["CANDLE_SOURCE"] = str(args.candle_source).strip().lower()
+    if getattr(args, "tick_source", ""):
+        os.environ["TICK_SOURCE"] = str(args.tick_source).strip().lower()
+    if getattr(args, "ob_source", ""):
+        os.environ["OB_SOURCE"] = str(args.ob_source).strip().lower()
+
     n_trials = args.trials
     if n_trials is None:
         n_trials = get_env_int("PARAM_SEARCH_OPTUNA_N_TRIALS", 200)