task: propagate correlation and stream ids in lifecycle logs

[greatKhalifa-code]

Implementation Details
This PR builds the necessary observability infrastructure from scratch and integrates it:

• New Infrastructure:

  • app/lib/logger.ts: Implemented a centralized, structured JSON logger.
  • app/lib/correlation-middleware.ts: Implemented correlation ID propagation using AsyncLocalStorage to maintain request context.
  • app/lib/privacy.ts: Implemented a utility to automatically redact sensitive information (secrets, tokens, PII) from log objects.

• Integration:

  • Updated all five stream lifecycle API routes (app/api/streams/[id]/) to emit structured info and warn logs.
  • Each log entry now includes the correlation_id, stream_id, action type, and status.
  • Logged stream data is passed through the redact() utility before being sent to the logger.

Key Features

• Backend Observability: Every lifecycle transition is now traceable with correlated logs.
• Security: Automated redaction ensures PII and secrets are not leaked to log aggregators.
• Consistency: Structured JSON logging ensures logs are machine-readable for monitoring and alerting.

Testing & Coverage

• Added unit tests for the new logging, privacy, and correlation infrastructure in app/lib/*.test.ts.

closes #242

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