feat(server): add Prometheus metrics for monitoring HTTP requests

feat(Jenkinsfile): add monitoring network setup for Docker container

fix(Jenkinsfile): update Slack token credential for notifications

fix(Jenkinsfile): enhance Slack notification debugging and error handling

refactor(Jenkinsfile): rename agent label for clarity

fix(Jenkinsfile): update App URL to use localhost for deployment link

revert the progress bar function

refactor(Jenkinsfile): encapsulate Slack notification in script block for improved structure

refactor(Jenkinsfile): streamline progress bar function and enhance readability

feat(pipeline): add initialization stage with progress bar for build tracking

feat(pipeline): add progress tracking and enhanced notifications

Added deployment start notification

Added start notification before Docker build begins

Update Jenkinsfile to use parameterized Slack channel for notifications, enhancing flexibility in communication settings. This change replaces the hardcoded SLACK_CHANNEL with params.SLACK_CHANNEL, allowing for dynamic channel selection based on build parameters.

Update Jenkinsfile to add SLACK_CHANNEL parameter for notifications and change default channel. This enhances flexibility in notification settings for builds.