feat: Add signalSource field to identify manual vs TradingView trades

- Set signalSource='manual' for Telegram trades, 'tradingview' for TradingView
- Updated analytics queries to exclude manual trades from indicator analysis
- getTradingStats() filters manual trades (TradingView performance only)
- Version comparison endpoint filters manual trades
- Created comprehensive filtering guide: docs/MANUAL_TRADE_FILTERING.md
- Ensures clean data for indicator optimization without contamination

app/api/analytics/version-comparison/route.ts

@@ -56,6 +56,7 @@ export async function GET() {
       WHERE "exitReason" IS NOT NULL 
         AND "exitReason" NOT LIKE '%CLEANUP%'
         AND "isTestTrade" = false
+        AND ("signalSource" IS NULL OR "signalSource" != 'manual')
       GROUP BY "indicatorVersion"
       ORDER BY version DESC
     `
@@ -78,6 +79,7 @@ export async function GET() {
       WHERE "exitReason" IS NOT NULL 
         AND "exitReason" NOT LIKE '%CLEANUP%'
         AND "isTestTrade" = false
+        AND ("signalSource" IS NULL OR "signalSource" != 'manual')
         AND "pricePositionAtEntry" < 15
       GROUP BY "indicatorVersion"
       ORDER BY version DESC