fix: correct ProcessEnv type import in txnBot

Changes ProcessEnv import from non-existent 'node:process' module
to use built-in NodeJS.ProcessEnv type.

Fixes TypeScript compilation error:
  Module '"node:process"' has no exported member 'ProcessEnv'

Also adds NodeJS to ESLint globals to resolve no-undef warning.

All services now healthy and operational.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

services/txnBot/eslint.config.js

@@ -18,6 +18,7 @@ export default [
         process: 'readonly',
         fetch: 'readonly',
         setInterval: 'readonly',
+        NodeJS: 'readonly',
       },
     },
     plugins: {