Refactor: Convert indicators to self-contained files

- Created moving_average.js consolidating ma.js, ma_indicator.js, sma.js, ema.js
- Made all indicators self-contained with embedded:
  * Math logic (no external dependencies)
  * Metadata (getMetadata())
  * Signal calculation (calculateXXXSignal)
  * Base class (inline BaseIndicator)
- Updated macd.js, hts.js to inline EMA/MA calculations
- Added signal functions to RSI, BB, Stochastic, ATR indicators
- Updated indicators/index.js to export both classes and signal functions
- Simplified signals-calculator.js to orchestrate using indicator signal functions
- Removed obsolete files: ma.js, base.js, ma_indicator.js, sma.js, ema.js

All indicators now fully self-contained with no external file dependencies
for math, signal calculation, or base class.

src/api/dashboard/static/js/indicators/atr.js

@@ -1,6 +1,70 @@
-import { BaseIndicator } from './base.js';
+// Self-contained ATR indicator
+// Includes math, metadata, signal calculation, and base class
 
+// Signal constants (defined in each indicator file)
+const SIGNAL_TYPES = {
+    BUY: 'buy',
+    SELL: 'sell',
+    HOLD: 'hold'
+};
+
+const SIGNAL_COLORS = {
+    buy: '#26a69a',
+    hold: '#787b86',
+    sell: '#ef5350'
+};
+
+// Base class (inline replacement for BaseIndicator)
+class BaseIndicator {
+    constructor(config) {
+        this.id = config.id;
+        this.type = config.type;
+        this.name = config.name;
+        this.params = config.params || {};
+        this.timeframe = config.timeframe || '1m';
+        this.series = [];
+        this.visible = config.visible !== false;
+        this.cachedResults = null;
+        this.cachedMeta = null;
+        this.lastSignalTimestamp = null;
+        this.lastSignalType = null;
+    }
+}
+
+// Signal calculation for ATR
+function calculateATRSignal(indicator, lastCandle, prevCandle, values) {
+    const atr = values?.atr;
+    const close = lastCandle.close;
+    const prevClose = prevCandle?.close;
+    
+    if (!atr || atr === null || !prevClose) {
+        return null;
+    }
+    
+    const atrPercent = atr / close * 100;
+    const priceChange = Math.abs(close - prevClose);
+    const atrRatio = priceChange / atr;
+    
+    if (atrRatio > 1.5) {
+        return {
+            type: SIGNAL_TYPES.HOLD,
+            strength: 70,
+            value: atr,
+            reasoning: `High volatility: ATR (${atr.toFixed(2)}, ${atrPercent.toFixed(2)}%)`
+        };
+    }
+    
+    return null;
+}
+
+// ATR Indicator class
 export class ATRIndicator extends BaseIndicator {
+    constructor(config) {
+        super(config);
+        this.lastSignalTimestamp = null;
+        this.lastSignalType = null;
+    }
+
     calculate(candles) {
         const period = this.params.period || 14;
         const results = new Array(candles.length).fill(null);
@@ -23,16 +87,32 @@ export class ATRIndicator extends BaseIndicator {
             atr = (atr * (period - 1) + tr[i]) / period;
             results[i] = atr;
         }
-        return results;
+        
+        return results.map(atr => ({ atr }));
     }
     
     getMetadata() {
         return {
             name: 'ATR',
             description: 'Average True Range - measures market volatility',
-            inputs: [{ name: 'period', label: 'Period', type: 'number', default: 14, min: 1, max: 100 }],
-            plots: [{ id: 'value', color: '#795548', title: 'ATR' }],
+            inputs: [{ 
+                name: 'period', 
+                label: 'Period', 
+                type: 'number', 
+                default: 14, 
+                min: 1, 
+                max: 100,
+                description: 'Period for ATR calculation'
+            }],
+            plots: [{ 
+                id: 'value', 
+                color: '#795548', 
+                title: 'ATR',
+                lineWidth: 1
+            }],
             displayMode: 'pane'
         };
     }
 }
+
+export { calculateATRSignal };