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/context/bot.js

@@ -1,13 +1,14 @@
 import TelegramBot from "node-telegram-bot-api";
 import config from "../config/config.js";
+import logger from "../utils/logger.js";
 
 const initBot = () => {
     try {
         const bot = new TelegramBot(config.BOT_TOKEN, {polling: true});
-        console.log('Bot initialized successfully');
+        logger.info('Bot initialized successfully');
         return bot;
     } catch (error) {
-        console.error('Failed to initialize bot:', error);
+        logger.error({ err: error }, 'Failed to initialize bot');
         process.exit(1);
     }
 };