feat(logging): replace 207 console.log/error/warn with pino structured logger (#58)

- Add pino + pino-pretty dependencies
- Create src/utils/logger.js with env-based LOG_LEVEL
- Replace all 207 console.log/error/warn calls across 46 source files
- Remove [DEBUG], [ERROR] string prefixes (levels convey this)
- Add pino redact for sensitive fields (mnemonic, privateKey, token, etc.)
- Structured logging with context objects instead of string interpolation
- NODE_ENV=production disables pino-pretty transport

49 files changed, 5601 insertions, 6056 deletions

src/index.js

@@ -2,6 +2,7 @@ import { runMigrations, cleanUpInvalidForeignKeys } from './migrations/runner.js
 import './router/routes.js';
 import bot from './context/bot.js';
 import ErrorHandler from './utils/errorHandler.js';
+import logger from './utils/logger.js';
 import userHandler from './handlers/userHandlers/userHandler.js';
 import adminHandler from './handlers/adminHandlers/adminHandler.js';
 import callbackRouter from './router/callbackRouter.js';
@@ -11,8 +12,7 @@ await runMigrations();
 await cleanUpInvalidForeignKeys();
 
 const logDebug = (action, functionName) => {
-    console.log(`[DEBUG] Button Press: ${action}`);
-    console.log(`[DEBUG] Calling Function: ${functionName}`);
+    logger.debug({ action, functionName }, 'Button Press');
 };
 
 bot.onText(/\/start/, async (msg) => {
@@ -63,7 +63,7 @@ bot.on('callback_query', async (callbackQuery) => {
 bot.on('polling_error', ErrorHandler.handlePollingError);
 
 process.on('unhandledRejection', (error) => {
-    console.error('Unhandled promise rejection:', error);
+    logger.error({ err: error }, 'Unhandled promise rejection');
 });
 
-console.log('Bot is running...');
+logger.info('Bot is running...');