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/utils/persistent-logger.ts

@@ -4,6 +4,7 @@
  */
 
 import * as fs from 'fs'
+import { logger } from '../utils/logger'
 import * as path from 'path'
 
 const LOG_DIR = '/app/logs'
@@ -31,7 +32,7 @@ function rotateLogIfNeeded(logPath: string) {
         const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
         const rotatedPath = `${logPath}.${timestamp}`
         fs.renameSync(logPath, rotatedPath)
-        console.log(`📦 Rotated log: ${rotatedPath}`)
+        logger.log(`📦 Rotated log: ${rotatedPath}`)
       }
     }
   } catch (error) {
@@ -86,7 +87,7 @@ export function logTradeExecution(
     : `Trade failed: ${tradeDetails.symbol} ${tradeDetails.direction} - ${tradeDetails.error}`
   
   const entry = formatLogEntry(level, message, tradeDetails)
-  console.log(success ? '✅' : '❌', message)
+  logger.log(success ? '✅' : '❌', message)
   appendToLog(TRADE_LOG, entry)
 }
 
@@ -109,7 +110,7 @@ export function logDatabaseOperation(
     : `${operation} failed: ${details.error?.message || 'Unknown error'}`
   
   const entry = formatLogEntry(level, message, details)
-  console.log(success ? '💾' : '❌', message)
+  logger.log(success ? '💾' : '❌', message)
   appendToLog(ERROR_LOG, entry)
 }