Add REST GET /config endpoint to fetch agent configuration

[Copilot]

Completed: Remove ConfigFile option and use ConfigPath instead

Summary

Removed the unnecessary ConfigFile option and updated the code to use the existing ConfigPath mechanism instead.

Changes Made:

1. config_options.hpp: Removed DECLARE_CONFIGURATION(ConfigFile) declaration
2. agent_config.cpp: Removed assignment of ConfigFile to options
3. rest_service.cpp:
   • Changed PUT /config handler to use ConfigPath instead of ConfigFile
   • Gets first path from ConfigPath list (the config file's parent directory)
   • Updated skip logic to skip ConfigPath instead of ConfigFile

How it works:

• AgentConfiguration automatically adds the config file's parent directory to the front of ConfigPath when loading config
• RestService accesses the first element of ConfigPath to get the config directory
• No new configuration option needed - uses existing infrastructure

Benefits:

• Cleaner code - no duplicate config path tracking
• Uses existing ConfigPath mechanism that's already passed to all sinks
• More maintainable - one source of truth for config paths

Testing:

The PUT /config functionality continues to work as before:

1. Gets config directory from first ConfigPath entry
2. Writes updated config to config.json in that directory
3. File monitoring detects change and triggers warm start

Original prompt

add a rest GET to fetch the agent config

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