feat: ATR-based trailing stop + rate limit monitoring

MAJOR FIXES:
- ATR-based trailing stop for runners (was fixed 0.3%, now adapts to volatility)
- Fixes runners with +7-9% MFE exiting for losses
- Typical improvement: 2.24x more room (0.3% → 0.67% at 0.45% ATR)
- Enhanced rate limit logging with database tracking
- New /api/analytics/rate-limits endpoint for monitoring

DETAILS:
- Position Manager: Calculate trailing as (atrAtEntry / price × 100) × multiplier
- Config: TRAILING_STOP_ATR_MULTIPLIER=1.5, MIN=0.25%, MAX=0.9%
- Settings UI: Added ATR multiplier controls
- Rate limits: Log hits/recoveries/exhaustions to SystemEvent table
- Documentation: ATR_TRAILING_STOP_FIX.md + RATE_LIMIT_MONITORING.md

IMPACT:
- Runners can now capture big moves (like morning's $172→$162 SOL drop)
- Rate limit visibility prevents silent failures
- Data-driven optimization for RPC endpoint health

app/settings/page.tsx

@@ -35,6 +35,9 @@ interface TradingSettings {
   PROFIT_LOCK_PERCENT: number
   USE_TRAILING_STOP: boolean
   TRAILING_STOP_PERCENT: number
+  TRAILING_STOP_ATR_MULTIPLIER: number
+  TRAILING_STOP_MIN_PERCENT: number
+  TRAILING_STOP_MAX_PERCENT: number
   TRAILING_STOP_ACTIVATION: number
   
   // ATR-based Dynamic Targets
@@ -608,13 +611,40 @@ export default function SettingsPage() {
               description="Enable trailing stop for 25% runner position when TP2 triggers. 0 = disabled, 1 = enabled."
             />
             <Setting
-              label="Trailing Stop Distance (%)"
+              label="Trailing Stop Distance (%) [FALLBACK]"
               value={settings.TRAILING_STOP_PERCENT}
               onChange={(v) => updateSetting('TRAILING_STOP_PERCENT', v)}
               min={0.1}
               max={2}
               step={0.1}
-              description="How far below peak price (for longs) to trail the stop loss. Example: 0.3% = SL trails 0.3% below highest price reached."
+              description="Legacy fallback used only if ATR data is unavailable. Normally, ATR-based trailing is used instead."
+            />
+            <Setting
+              label="ATR Trailing Multiplier"
+              value={settings.TRAILING_STOP_ATR_MULTIPLIER}
+              onChange={(v) => updateSetting('TRAILING_STOP_ATR_MULTIPLIER', v)}
+              min={1.0}
+              max={3.0}
+              step={0.1}
+              description="🔥 NEW: Trailing distance = (ATR × multiplier). Example: 0.5% ATR × 1.5 = 0.75% trailing. Higher = more room for runner, lower = tighter protection."
+            />
+            <Setting
+              label="Min Trailing Distance (%)"
+              value={settings.TRAILING_STOP_MIN_PERCENT}
+              onChange={(v) => updateSetting('TRAILING_STOP_MIN_PERCENT', v)}
+              min={0.1}
+              max={1.0}
+              step={0.05}
+              description="Minimum trailing distance cap. Prevents ultra-tight stops in low ATR conditions."
+            />
+            <Setting
+              label="Max Trailing Distance (%)"
+              value={settings.TRAILING_STOP_MAX_PERCENT}
+              onChange={(v) => updateSetting('TRAILING_STOP_MAX_PERCENT', v)}
+              min={0.5}
+              max={2.0}
+              step={0.1}
+              description="Maximum trailing distance cap. Prevents excessively wide stops in high ATR conditions."
             />
             <Setting
               label="Trailing Stop Activation (%)"