style(risk): polish account status badge for light and dark themes

Extract shared account_risk_badge.css with theme-aware contrast, dot indicator, and hub/instance layout fixes.

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

manual_trading_hub/hub.py

@@ -518,6 +518,18 @@ app = FastAPI(title="复盘系统中控", docs_url=None, redoc_url=None, lifespa
 STATIC_DIR = DIR / "static"
 _REPO_STATIC = _REPO_ROOT / "static"
 _AI_REVIEW_RENDER_JS = _REPO_STATIC / "ai_review_render.js"
+_ACCOUNT_RISK_BADGE_CSS = _REPO_STATIC / "account_risk_badge.css"
+
+
+@app.get("/assets/account_risk_badge.css")
+def hub_account_risk_badge_css():
+    """与四所实例共用仓库根 static/account_risk_badge.css。"""
+    if not _ACCOUNT_RISK_BADGE_CSS.is_file():
+        raise HTTPException(status_code=404, detail="account_risk_badge.css not found")
+    return FileResponse(
+        str(_ACCOUNT_RISK_BADGE_CSS),
+        media_type="text/css; charset=utf-8",
+    )
 
 
 @app.get("/assets/ai_review_render.js")