fix: FARTCOIN symbol normalization priority

- Problem: FARTCOIN signals being treated as SOL-PERP
- Root cause: Symbol normalization checked includes('SOL') before FARTCOIN
- Since TradingView may send symbols with 'SOL' in name, order matters

Files changed:
- config/trading.ts: Reordered checks (FARTCOIN before SOL)
- app/api/trading/market-data/route.ts: Added FARTCOIN mappings

Symbol matching now checks:
1. FARTCOIN/FART (most specific)
2. SOL (catch-all for Solana)
3. BTC, ETH (other majors)
4. Default fallback

This fixes TradingView alerts for FARTCOIN 5-min and 1-min data
collection being incorrectly stored as SOL-PERP in BlockedSignal table.

Status: ✅ DEPLOYED Dec 7, 2025 19:30 CET
Next FARTCOIN signal will correctly save as FARTCOIN-PERP

config/trading.ts

@@ -255,10 +255,12 @@ export const SUPPORTED_MARKETS: Record<string, MarketConfig> = {
 export function normalizeTradingViewSymbol(tvSymbol: string): string {
   const upper = tvSymbol.toUpperCase()
   
+  // Check FARTCOIN before SOL (FARTCOIN may contain SOL in ticker name)
+  if (upper.includes('FARTCOIN')) return 'FARTCOIN-PERP'
+  if (upper.includes('FART')) return 'FARTCOIN-PERP'
   if (upper.includes('SOL')) return 'SOL-PERP'
   if (upper.includes('BTC')) return 'BTC-PERP'
   if (upper.includes('ETH')) return 'ETH-PERP'
-  if (upper.includes('FARTCOIN')) return 'FARTCOIN-PERP'
   
   // Default to SOL if unknown
   console.warn(`Unknown symbol ${tvSymbol}, defaulting to SOL-PERP`)