fix: unify order/key focus K-line theme, PnL, RR and exchange price tick

Share focus_chart templates and APIs across four instances; align chart Y-axis, price lines and meta bar with exchange symbol precision and live unrealized PnL.

Co-authored-by: Cursor <cursoragent@cursor.com>

hub_bridge.py

@@ -51,6 +51,8 @@ def install_instance_theme_static(app) -> None:
     assets = {
         "instance_theme.js": "application/javascript; charset=utf-8",
         "instance_theme.css": "text/css; charset=utf-8",
+        "focus_chart_page.js": "application/javascript; charset=utf-8",
+        "focus_chart_page.css": "text/css; charset=utf-8",
     }
 
     for name, mime in assets.items():