feat: major cleanup + death alerts + idle detection + Discord webhooks

Cleanup:
- Removed 109 stale asset files from static/assets/ (was 122, now 13)
- Removed static/v2/ entirely (was duplicate of root assets)
- Removed dead dashboard code: DashboardView, Layout, GlobalStats,
  CharacterCard, CharacterGrid, VitalBar, TabContainer, CombatTab,
  RaresTab, MapTab, InventoryTab, global.css, MapTransformContext
- Removed recharts dependency (425KB chunk eliminated)
- CSS reduced from 17KB to 10KB
- Added deploy-frontend.sh script for one-command build+deploy
- Updated CLAUDE.md with combat_stats, share_*, dungeon_map events
  and React frontend architecture

Death alerts (frontend + backend):
- Frontend: DeathNotification component with red banner + sawtooth
  sound when vitae goes from 0 to >0
- Backend: detects vitae transition in vitals handler, sends Discord
  webhook to #aclog with "☠️ CHARACTER died! (vitae: X%)"
- Rate-limited: max 1 Discord alert per character per 5 minutes

Idle detection (backend):
- Background task runs every 60 seconds
- Detects: vt_state "default"/"idle" OR kph=0 while in combat/hunt
- Sends Discord webhook: "⚠️ CHARACTER appears idle (state: X, KPH: 0)"
- Auto-clears alert when character becomes active again
- No duplicate alerts for same idle period

Discord integration:
- DISCORD_ACLOG_WEBHOOK env var for webhook URL
- Used by both death alerts and idle detection
- Graceful fallback when not configured

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/effects/DeathNotification.tsx

@@ -0,0 +1,71 @@
+import React, { useEffect, useState, useRef } from 'react';
+
+interface DeathAlert {
+  character_name: string;
+  vitae: number;
+  timestamp: string;
+}
+
+interface Props {
+  deathAlerts: DeathAlert[];
+}
+
+interface ActiveNotification {
+  key: number;
+  alert: DeathAlert;
+  exiting: boolean;
+}
+
+let deathKey = 0;
+
+export const DeathNotification: React.FC<Props> = ({ deathAlerts }) => {
+  const [active, setActive] = useState<ActiveNotification[]>([]);
+  const lastCount = useRef(0);
+
+  useEffect(() => {
+    if (deathAlerts.length > lastCount.current && lastCount.current > 0) {
+      const newAlerts = deathAlerts.slice(lastCount.current);
+      for (const alert of newAlerts) {
+        const key = ++deathKey;
+        setActive(prev => [...prev, { key, alert, exiting: false }]);
+        // Sound
+        try {
+          const ctx = new AudioContext();
+          const osc = ctx.createOscillator();
+          const gain = ctx.createGain();
+          osc.connect(gain); gain.connect(ctx.destination);
+          osc.frequency.value = 440; osc.type = 'sawtooth'; gain.gain.value = 0.2;
+          osc.start();
+          gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.8);
+          osc.stop(ctx.currentTime + 0.8);
+        } catch {}
+        // Auto-dismiss after 8s
+        setTimeout(() => {
+          setActive(prev => prev.map(n => n.key === key ? { ...n, exiting: true } : n));
+          setTimeout(() => setActive(prev => prev.filter(n => n.key !== key)), 500);
+        }, 8000);
+      }
+    }
+    lastCount.current = deathAlerts.length;
+  }, [deathAlerts.length]); // eslint-disable-line react-hooks/exhaustive-deps
+
+  if (active.length === 0) return null;
+
+  return (
+    <div style={{ position: 'fixed', top: 70, left: '50%', transform: 'translateX(-50%)', zIndex: 99999, display: 'flex', flexDirection: 'column', gap: 6, pointerEvents: 'none' }}>
+      {active.map(n => (
+        <div key={n.key} style={{
+          background: 'linear-gradient(135deg, #2a0a0a, #1a0000)',
+          border: '2px solid #cc4444',
+          borderRadius: 8, padding: '12px 24px', textAlign: 'center',
+          boxShadow: '0 0 30px rgba(204, 68, 68, 0.3)',
+          animation: n.exiting ? 'ml-notif-out 0.5s ease-in forwards' : 'ml-notif-in 0.5s ease-out',
+        }}>
+          <div style={{ fontSize: '1.2rem', fontWeight: 800, color: '#ff4444' }}>☠️ CHARACTER DIED ☠️</div>
+          <div style={{ fontSize: '1rem', fontWeight: 600, color: '#fff', marginTop: 2 }}>{n.alert.character_name}</div>
+          <div style={{ fontSize: '0.8rem', color: '#c88', marginTop: 2 }}>Vitae: {n.alert.vitae}%</div>
+        </div>
+      ))}
+    </div>
+  );
+};