improved readiness probe

[zszabo-rh]

Description

Current readiness probe couldn't detect configuration loading failures due to unresolved environment variables, because the application crashed before the probe endpoint was available. Also there were no validation of template placeholder resolution and no comprehensive application initialization tracking.

Enhanced readiness probe detects unresolved template placeholders using generic pattern matching, monitors initialization steps (config loading, llama client, MCP servers, etc.) while maintaining existing LLM provider health functionality. It also returns detailed reason in readiness probe response for troubleshooting.

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement

Related Tickets & Documents

• Related Issue MGMT-21679: Improve readiness prob
• Closes #

Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
• If it is a core feature, I have added thorough tests.

Testing

Tested by building and running local assisted-chat stack.
Readiness probe response when using bad config: (HTTP 503 Service Unavailable)

{
  "ready": false,
  "reason": "Configuration loading failed: 2 validation errors for Configuration\nauthentication.jwk_config.jwt_configuration.role_rules\n  Input should be a valid list [type=list_type, input_value='${{AUTHN_ROLE_RULES}}', input_type=str]\n    For further information visit https://errors.pydantic.dev/2.11/v/list_type\nauthorization.access_rules\n  Input should be a valid list [type=list_type, input_value='${{AUTHN_ACCESS_RULES}}', input_type=str]\n    For further information visit https://errors.pydantic.dev/2.11/v/list_type",
  "providers": []
}

Same with proper config:

{
  "ready": true,
  "reason": "Application fully initialized and ready",
  "providers": []
}

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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