Handle empty device ID

[myleshorton]

lantern-outline does not currently have code to pass a device ID to common.Init, so this code fails. This checks for an empty ID and sets it if it's empty.

This pull request makes several improvements to how the application initializes and manages configuration, particularly with regards to device ID handling and OpenTelemetry (OTEL) setup. The main changes are focused on ensuring that a device ID is always set, refactoring function signatures to use pointers for configuration objects, and making minor code cleanups.

Device ID management and initialization:

• The Init function in common/init.go now ensures that if the deviceID parameter is empty, it is automatically set using deviceid.Get(), improving robustness in device identification.
• The deviceid package is now imported in common/init.go to support the above enhancement.

Configuration and OpenTelemetry (OTEL) setup:

• The initOTEL function and its callers have been refactored to accept a pointer to ConfigResponse instead of a value, ensuring more efficient memory usage and consistency across the codebase. [1] [2]
• The SetupOTelSDK function in metrics/otel.go has also been updated to accept a pointer to ConfigResponse, aligning with the changes in initOTEL.

Code cleanup:

• The ReplaceAttr function in the logger initialization now ignores the groups parameter by using _, which is a minor code style improvement.

[Copilot]

Pull Request Overview

This PR improves device ID handling and configuration management by ensuring a device ID is always set when empty and refactoring OpenTelemetry configuration to use pointer parameters for better memory efficiency.

• Adds automatic device ID generation when the provided ID is empty
• Updates OpenTelemetry configuration functions to accept pointer parameters instead of values
• Minor code cleanup for unused parameter handling

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
common/init.go	Adds device ID fallback logic and updates function signatures to use config pointers
metrics/otel.go	Updates SetupOTelSDK function to accept config pointer parameter

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