feat: show Linux-style total CPU usage (sum of cores, can exceed 100%)

bot.py

@@ -48,7 +48,10 @@ def fmt_status(s: dict) -> str:
         power_str = f"{p['total_watts']}W [{src}]{extra}"
     lines.append(f"⚡ 功耗: {power_str}")
     load = c["load"]
-    lines.append(f"🖥 CPU: {c['percent']}%  核心 {c['cores']}  负载 {load[0]:.2f}/{load[1]:.2f}/{load[2]:.2f}")
+    total_pct = sum(c["per_core"])
+    lines.append(f"🖥 CPU: {total_pct:.1f}% / {c['cores'] * 100}%  "
+                 f"(单核均值 {c['percent']}%)  核心 {c['cores']}  "
+                 f"负载 {load[0]:.2f}/{load[1]:.2f}/{load[2]:.2f}")
     lines.append(f"💾 内存: {m['used_gb']}/{m['total_gb']}GB ({m['percent']}%)  Swap {m['swap_percent']}%")
     if s["temps"]:
         flat = [t for entries in s["temps"].values() for t in entries]