fix: replace console.error with Nest Logger in rate-limit.guard.ts

[Danielobito009]

Summary

Closes #779. Replaces console.error with NestJS structured Logger
in rate-limit.guard.ts for consistent log formatting.

Changes

• src/auth/guards/rate-limit.guard.ts
  • Imported Logger from @nestjs/common
  • Added private readonly logger = new Logger(RateLimitGuard.name)
  • Replaced console.error(...) with this.logger.error(...)

Why

NestJS Logger provides structured output with timestamps, context
labels, and log levels — making errors easier to trace in production
vs raw console.error output.

closes #779

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