feat: Search Field in Endpoint Summary and refactoring of endpoint config for multiple YAML files

[javaChip56]

This PR adds two usability improvements to the dashboard:

• adds a search field to the Endpoint Summary table so users can quickly filter endpoints by name, id, status, or error text
• refactors configuration loading to support a single dashboard YAML file plus multiple endpoint YAML files

What Changed

• introduced client-side endpoint filtering on the dashboard summary page
• updated the dashboard header layout so search and Refresh All align cleanly
• added dashboard.yaml as the primary dashboard config entry point
• added support for endpointFiles so endpoint definitions can live in separate YAML files
• kept legacy EndpointsConfigPath support as a fallback while moving to DashboardConfigPath
• updated sample config files and publish-copy behavior for YAML assets
• expanded YAML loader test coverage for multi-file loading and missing-file handling
• refreshed README documentation to reflect the new config structure and dashboard search behavior

[javaChip56]

Looks ok.