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.

static/css/backtest.css

@@ -281,6 +281,40 @@
   .optuna-prog-fill.is-error { background: var(--red); }
   .optuna-prog-fill.is-post { background: #d29922; }
 
+  .opt-join-overlay {
+    display: none;
+    position: fixed;
+    inset: 0;
+    z-index: 2200;
+    background: rgba(0, 0, 0, 0.62);
+    align-items: center;
+    justify-content: center;
+    padding: 16px;
+  }
+  .opt-join-overlay.is-open { display: flex; }
+  .opt-join-panel {
+    background: var(--surface);
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    max-width: 860px;
+    width: 100%;
+    max-height: 90vh;
+    overflow: auto;
+    padding: 16px;
+  }
+  .opt-join-pre {
+    font-size: 11px;
+    white-space: pre-wrap;
+    word-break: break-all;
+    background: #0d1117;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    padding: 10px;
+    color: var(--text);
+    max-height: 220px;
+    overflow: auto;
+  }
+
   /* 오늘 운영 — 조건검색 이력(키움/LS) */
   .dash-univ-table .dash-univ-src-kiwoom { color: #58a6ff; font-weight: 600; }
   .dash-univ-table .dash-univ-src-kis { color: #3fb950; font-weight: 600; }