Refactor push notification handling and configuration

Replaces hardcoded CORS and Keycloak error handling with explicit error messages. Updates Kafka topic and header configurations for better alignment with notification models. Introduces `send_undeliverable_notifications` method with filtering to streamline push notification logic. Integrates `NotificationEvent` for targeted notification handling.

Hardening Docker Image

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	.idea/workspace.xml

change room img path

change room img path

Add welcome message displaying app version and run mode

Introduces a new `welcome` module to print a stylized app title, version, and run mode on startup. Updates main entry point to invoke the welcome message for better startup visibility.

Refactor room and messaging services: simplify logic, enhance Redis c…

…aching integration, and optimize room queries

Streamlines room creation, invitation, and messaging workflows. Improves synchronization between Redis caching and database operations. Updates room queries for better performance and consistency. Adds error handling for caching operations.

fix env

Added tagging to pipeline.yml

Readme improved