[#15] fix(config): update sensor manifest and medkit params

[bburda]

Description

Update manifest path, params and manifest file for proper discovery.

Related Issue

closes #15

Checklist

• Tested locally
• README updated (if needed)

[Copilot]

Pull request overview

This PR fixes a bug in the sensor diagnostics demo where an incorrect manifest parameter name prevented the manifest from being used for discovery, causing the demo to always run in runtime discovery mode. The fix updates the parameter structure to match the current ros2_medkit_gateway API and enhances the manifest with more detailed component and app definitions.

Changes:

• Fixed manifest parameter name from nested manifest.path to flat manifest_path in launch file and configuration
• Updated discovery configuration structure with explicit discovery_mode parameter set to "hybrid"
• Enhanced sensor manifest with detailed app definitions using ros_binding, explicit component types, and added missing components (fault-manager, diagnostic-bridge-unit)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
demos/sensor_diagnostics/launch/demo.launch.py	Changed manifest parameter from manifest.path to manifest_path to match updated API
demos/sensor_diagnostics/config/medkit_params.yaml	Restructured discovery configuration with flat parameter names, added discovery_mode: "hybrid", and increased refresh interval to reduce logging
demos/sensor_diagnostics/config/sensor_manifest.yaml	Added config section, component types, comprehensive apps section with ros_binding details, and functions section for better manifest-based discovery
demos/sensor_diagnostics/Dockerfile	Removed outdated comparison comments

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