Add per-request memory cap via

[RemmyAcee]

Close: #581
implemented:

1. Added new config option in src/config/index.ts : NODE_MAX_OLD_SPACE_SIZE_MB environment variable for setting memory limit
2. Updated .env.example : Added documentation for NODE_MAX_OLD_SPACE_SIZE_MB
3. Added OOM metrics in src/middleware/metrics.ts : New oom_events_total counter metric and recordOomEvent() function
4. Added event listeners in src/index.ts : Listens for uncaught exceptions and unhandled rejections, increments metric when heap out of memory is detected
5. Updated Dockerfile : Added entrypoint script to set --max-old-space-size automatically based on NODE_MAX_OLD_SPACE_SIZE_MB
6. Added entrypoint.sh : Script that configures Node.js options
7. Updated docs/monitoring.md : Added Memory & OOM Metrics section and Memory Configuration section with examples
8. Created PRODUCTION.md : New file documenting recommended production memory configuration

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[Baskarayelu]

Add per-request memory cap via — nice work, merging 👍