Refactor dashboard JS to ES modules; fix collector strategy loading and add auto-backfill

- Split inline JS into separate ES module files (indicators/, strategies/, ui/, utils/)
- Fix brain.py strategy registry to use MAStrategy directly instead of missing modules
- Add auto-backfill for detected data gaps in collector monitoring loop
- Fix chart resize on sidebar toggle
- Fix chart scrollToTime -> setVisibleLogicalRange

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

@@ -0,0 +1,30 @@
+export { MA } from './ma.js';
+export { BaseIndicator } from './base.js';
+export { HTSIndicator } from './hts.js';
+export { SMAIndicator } from './sma.js';
+export { EMAIndicator } from './ema.js';
+export { RSIIndicator } from './rsi.js';
+export { BollingerBandsIndicator } from './bb.js';
+export { MACDIndicator } from './macd.js';
+export { StochasticIndicator } from './stoch.js';
+export { ATRIndicator } from './atr.js';
+
+import { HTSIndicator } from './hts.js';
+import { SMAIndicator } from './sma.js';
+import { EMAIndicator } from './ema.js';
+import { RSIIndicator } from './rsi.js';
+import { BollingerBandsIndicator } from './bb.js';
+import { MACDIndicator } from './macd.js';
+import { StochasticIndicator } from './stoch.js';
+import { ATRIndicator } from './atr.js';
+
+export const IndicatorRegistry = {
+    hts: HTSIndicator,
+    sma: SMAIndicator,
+    ema: EMAIndicator,
+    rsi: RSIIndicator,
+    bb: BollingerBandsIndicator,
+    macd: MACDIndicator,
+    stoch: StochasticIndicator,
+    atr: ATRIndicator
+};