feat: Enhance Optuna integration and logging for backtesting framework

Changes:
- Added new API endpoints for continuing and confirming Optuna jobs, allowing for better management of ongoing studies.
- Introduced detailed logging for tick feed tracking and order book processing, improving traceability of vendor performance during backtests.
- Updated database schema to include new fields for managing Optuna study results, enhancing the ability to track study progress and outcomes.
- Refactored existing functions to utilize the new logging and tracking features, ensuring consistency across the backtesting framework.

Impact:
- These enhancements improve the robustness and transparency of the Optuna backtesting process, facilitating better analysis and optimization of trading strategies.

docs/옵투나.md

@@ -32,6 +32,10 @@ python3 -u kis_trader/backtest/optuna_rerun_postprocess.py \
 웹 Optuna 버튼도 완료 시 후처리를 붙인다 (`optuna_postprocess_topn`).  
 `orderbook_recommend` 블록 + `postprocess_topn` 이 JSON에 실림.
 
+**후처리 자동 실행 게이트** (`kis_study_trials` / `--study-trials`):  
+끝난 기준 = **시도 수** `COMPLETE + PRUNED + FAIL` ≥ 목표.  
+`tp_max < tp` 같은 pruned(문제 출제 오류)도 시도로 친다. COMPLETE만 세서 스킵하지 않음 (2026-08-21).
+
 ---
 
 ## 2. 진입 후처리 격자 (env_config_ext)