feat: Add position scaling controls to settings UI

**UI Updates (settings page):**
Added new '📈 Position Scaling' section with:
- Enable/disable toggle (defaults to OFF)
- Min quality score slider (60-90, default 75)
- Min profit to scale (0-2%, default 0.4%)
- Scale size percent (10-100%, default 50%)
- Max position multiplier (1-3x, default 2.0x)
- Min ADX increase (0-15, default 5)
- Max price position for scale (50-90%, default 70%)

**Visual Feedback:**
- Purple-themed section with warning banner
- Real-time risk calculator showing:
  * Original position size (SOL example)
  * Scale addition amount
  * Total after 1 scale
  * Maximum possible position size
- Dynamic descriptions explain each parameter
- Warning: 'DISABLED by default' with red indicator

**API Updates:**
Extended /api/settings GET/POST to handle 7 new fields:
- ENABLE_POSITION_SCALING
- MIN_SCALE_QUALITY_SCORE
- MIN_PROFIT_FOR_SCALE
- MAX_SCALE_MULTIPLIER
- SCALE_SIZE_PERCENT
- MIN_ADX_INCREASE
- MAX_PRICE_POSITION_FOR_SCALE

**User Flow:**
1. Navigate to http://localhost:3001/settings
2. Scroll to '📈 Position Scaling' section
3. Toggle 'Enable Position Scaling' to 1
4. Adjust thresholds (defaults are conservative)
5. See live calculation of scaling impact
6. Click 'Save Settings'
7. Click 'Restart Bot' to apply

**Safety:**
- Feature OFF by default (requires explicit opt-in)
- Warning banner explains scaling behavior
- Risk calculator shows maximum exposure
- Conservative defaults prevent aggressive scaling
- All parameters adjustable via sliders

**Example:**
With defaults (SOL $210×10x = $2100):
- Scale adds: $1050 (50% of $2100)
- Total after 1 scale: $3150
- Max position (2x): $4200

User can now enable and configure position scaling without touching .env file!

app/settings/page.tsx

@@ -34,6 +34,17 @@ interface TradingSettings {
   USE_TRAILING_STOP: boolean
   TRAILING_STOP_PERCENT: number
   TRAILING_STOP_ACTIVATION: number
+  
+  // Position Scaling
+  ENABLE_POSITION_SCALING: boolean
+  MIN_SCALE_QUALITY_SCORE: number
+  MIN_PROFIT_FOR_SCALE: number
+  MAX_SCALE_MULTIPLIER: number
+  SCALE_SIZE_PERCENT: number
+  MIN_ADX_INCREASE: number
+  MAX_PRICE_POSITION_FOR_SCALE: number
+  
+  // Safety
   MAX_DAILY_DRAWDOWN: number
   MAX_TRADES_PER_HOUR: number
   MIN_TIME_BETWEEN_TRADES: number
@@ -520,6 +531,107 @@ export default function SettingsPage() {
             />
           </Section>
 
+          {/* Position Scaling */}
+          <Section title="📈 Position Scaling" description="Add to profitable positions with strong confirmation">
+            <div className="mb-4 p-3 bg-purple-500/10 border border-purple-500/30 rounded-lg">
+              <p className="text-sm text-purple-400 mb-2">
+                <strong>⚠️ Advanced Feature:</strong> Scale into existing profitable positions when high-quality signals confirm trend strength.
+              </p>
+              <p className="text-xs text-gray-400">
+                <strong>When enabled:</strong> Same-direction signals will ADD to position (not rejected) if quality ≥{settings?.MIN_SCALE_QUALITY_SCORE || 75}, 
+                profit ≥{settings?.MIN_PROFIT_FOR_SCALE || 0.4}%, ADX increased ≥{settings?.MIN_ADX_INCREASE || 5}, and price position &lt;{settings?.MAX_PRICE_POSITION_FOR_SCALE || 70}%.
+              </p>
+            </div>
+            <Setting
+              label="Enable Position Scaling"
+              value={settings.ENABLE_POSITION_SCALING ? 1 : 0}
+              onChange={(v) => updateSetting('ENABLE_POSITION_SCALING', v === 1)}
+              min={0}
+              max={1}
+              step={1}
+              description="🔴 DISABLED by default. Enable to allow scaling into profitable positions. 0 = block duplicates (safe), 1 = allow scaling (aggressive)."
+            />
+            <Setting
+              label="Min Quality Score for Scaling"
+              value={settings.MIN_SCALE_QUALITY_SCORE}
+              onChange={(v) => updateSetting('MIN_SCALE_QUALITY_SCORE', v)}
+              min={60}
+              max={90}
+              step={5}
+              description="Scaling signal must score this high (0-100). Higher = more selective. Recommended: 75 (vs 60 for initial entry)."
+            />
+            <Setting
+              label="Min Profit to Scale (%)"
+              value={settings.MIN_PROFIT_FOR_SCALE}
+              onChange={(v) => updateSetting('MIN_PROFIT_FOR_SCALE', v)}
+              min={0}
+              max={2}
+              step={0.1}
+              description="Position must be this profitable before scaling. Example: 0.4% = must be at/past TP1. NEVER scales into losing positions."
+            />
+            <Setting
+              label="Scale Size (%)"
+              value={settings.SCALE_SIZE_PERCENT}
+              onChange={(v) => updateSetting('SCALE_SIZE_PERCENT', v)}
+              min={10}
+              max={100}
+              step={10}
+              description="Add this % of original position size. Example: 50% = if original was $2100, scale adds $1050."
+            />
+            <Setting
+              label="Max Total Position Size (multiplier)"
+              value={settings.MAX_SCALE_MULTIPLIER}
+              onChange={(v) => updateSetting('MAX_SCALE_MULTIPLIER', v)}
+              min={1}
+              max={3}
+              step={0.5}
+              description="Max total position size after scaling. Example: 2.0 = can scale to 200% of original (original + 1 scale of 100%)."
+            />
+            <Setting
+              label="Min ADX Increase"
+              value={settings.MIN_ADX_INCREASE}
+              onChange={(v) => updateSetting('MIN_ADX_INCREASE', v)}
+              min={0}
+              max={15}
+              step={1}
+              description="ADX must increase by this much since entry. Example: 5 = if entered at ADX 15, scale requires ADX ≥20. Confirms trend strengthening."
+            />
+            <Setting
+              label="Max Price Position for Scale (%)"
+              value={settings.MAX_PRICE_POSITION_FOR_SCALE}
+              onChange={(v) => updateSetting('MAX_PRICE_POSITION_FOR_SCALE', v)}
+              min={50}
+              max={90}
+              step={5}
+              description="Don't scale if price is above this % of range. Example: 70% = blocks scaling near resistance. Prevents chasing."
+            />
+            
+            {/* Risk Calculator for Scaling */}
+            {settings.ENABLE_POSITION_SCALING && (
+              <div className="mt-4 p-4 bg-purple-900/20 border border-purple-500/30 rounded-lg">
+                <h4 className="text-sm font-semibold text-purple-400 mb-2">📊 Scaling Impact (SOL Example)</h4>
+                <div className="space-y-1 text-xs text-gray-300">
+                  <div className="flex justify-between">
+                    <span>Original Position:</span>
+                    <span className="font-mono">${settings.SOLANA_POSITION_SIZE * settings.SOLANA_LEVERAGE}</span>
+                  </div>
+                  <div className="flex justify-between">
+                    <span>Scale Addition ({settings.SCALE_SIZE_PERCENT}%):</span>
+                    <span className="font-mono text-yellow-400">+${((settings.SOLANA_POSITION_SIZE * settings.SOLANA_LEVERAGE) * (settings.SCALE_SIZE_PERCENT / 100)).toFixed(0)}</span>
+                  </div>
+                  <div className="flex justify-between border-t border-purple-500/30 pt-1 mt-1">
+                    <span className="font-semibold">Total After 1 Scale:</span>
+                    <span className="font-mono font-semibold text-purple-400">${((settings.SOLANA_POSITION_SIZE * settings.SOLANA_LEVERAGE) * (1 + settings.SCALE_SIZE_PERCENT / 100)).toFixed(0)}</span>
+                  </div>
+                  <div className="flex justify-between">
+                    <span className="font-semibold">Max Position ({settings.MAX_SCALE_MULTIPLIER}x):</span>
+                    <span className="font-mono font-semibold text-red-400">${((settings.SOLANA_POSITION_SIZE * settings.SOLANA_LEVERAGE) * settings.MAX_SCALE_MULTIPLIER).toFixed(0)}</span>
+                  </div>
+                </div>
+              </div>
+            )}
+          </Section>
+
           {/* Trade Limits */}
           <Section title="⚠️ Safety Limits" description="Prevent overtrading and excessive losses">
             <Setting