refactor(logging): replace console calls with injected Nest Logger

[rabsqueen]

🎯 Overview

Resolves #1042

Replaces unindexed console.* outputs with NestJS's structured Logger:

• Connects log statements to correlation IDs, service tags, and indexed context fields.
• Replaced direct console calls in automation.service.ts, achievements.seed.ts, and slack.service.ts.
• Configured the ESLint no-console rule to prevent unindexed console logging from breaking production log aggregation pipelines.

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🛠️ Key Architectural Changes

1. Logger Integration

• Replaced console.warn in automation.service.ts with structured this.logger.warn including workflowId and actionType.
• Introduced contextual Logger('AchievementsSeed') in achievements.seed.ts.
• Replaced commented-out console lines in slack.service.ts with active this.logger.error handling.

2. ESLint Configuration (.eslintrc.js)

• Enforced 'no-console': 'error' for all files in src/**.
• Configured narrow overrides allowing console output for explicit CLI and migration seed scripts.

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🧪 Testing & Verification

npm run lint:ci
npm run test

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[RUKAYAT-CODER]

Well done on the job done so far!
Kindly fix workflow to pass.