feat: Add production logging gating (Phase 1, Task 1.1)

- Created logger utility with environment-based gating (lib/utils/logger.ts)
- Replaced 517 console.log statements with logger.log (71% reduction)
- Fixed import paths in 15 files (resolved comment-trapped imports)
- Added DEBUG_LOGS=false to .env
- Achieves 71% immediate log reduction (517/731 statements)
- Expected 90% reduction in production when deployed

Impact: Reduced I/O blocking, lower log volume in production
Risk: LOW (easy rollback, non-invasive)
Phase: Phase 1, Task 1.1 (Quick Wins - Console.log Production Gating)

Files changed:
- NEW: lib/utils/logger.ts (production-safe logging)
- NEW: scripts/replace-console-logs.js (automation tool)
- Modified: 15 lib/*.ts files (console.log → logger.log)
- Modified: .env (DEBUG_LOGS=false)

Next: Task 1.2 (Image Size Optimization)

lib/trading/market-data-cache.ts

@@ -1,3 +1,5 @@
+import { logger } from '../utils/logger'
+
 /**
  * Market Data Cache Service
  * 
@@ -29,7 +31,7 @@ class MarketDataCache {
    */
   set(symbol: string, metrics: MarketMetrics): void {
     this.cache.set(symbol, metrics)
-    console.log(
+    logger.log(
       `📊 Cached market data for ${symbol}: ` +
       `ADX=${metrics.adx.toFixed(1)} ` +
       `ATR=${metrics.atr.toFixed(2)}% ` +
@@ -46,18 +48,18 @@ class MarketDataCache {
     const data = this.cache.get(symbol)
     
     if (!data) {
-      console.log(`⚠️ No cached data for ${symbol}`)
+      logger.log(`⚠️ No cached data for ${symbol}`)
       return null
     }
 
     const ageSeconds = Math.round((Date.now() - data.timestamp) / 1000)
     
     if (Date.now() - data.timestamp > this.MAX_AGE_MS) {
-      console.log(`⏰ Cached data for ${symbol} is stale (${ageSeconds}s old, max 300s)`)
+      logger.log(`⏰ Cached data for ${symbol} is stale (${ageSeconds}s old, max 300s)`)
       return null
     }
 
-    console.log(`✅ Using fresh TradingView data for ${symbol} (${ageSeconds}s old)`)
+    logger.log(`✅ Using fresh TradingView data for ${symbol} (${ageSeconds}s old)`)
     return data
   }
 
@@ -102,7 +104,7 @@ class MarketDataCache {
    */
   clear(): void {
     this.cache.clear()
-    console.log('🗑️ Market data cache cleared')
+    logger.log('🗑️ Market data cache cleared')
   }
 }
 
@@ -112,7 +114,7 @@ let marketDataCache: MarketDataCache | null = null
 export function getMarketDataCache(): MarketDataCache {
   if (!marketDataCache) {
     marketDataCache = new MarketDataCache()
-    console.log('🔧 Initialized Market Data Cache (5min expiry)')
+    logger.log('🔧 Initialized Market Data Cache (5min expiry)')
   }
   return marketDataCache
 }