[Bug]: Remove Hardcoded Firebase Function URL and Replace with Environment-Based Configuration

[sohampirale]

Description

The calibration webhook URL is currently hardcoded in the backend, which tightly couples the application logic to a specific Firebase/Cloud Run deployment. This creates several issues:

• Breaks local development when using Firebase emulators

Current Problem

Because the function URL is hardcoded, the calibration test does not complete successfully in environments where the URL differs. As a result, the calibration data is not properly sent to the registered Firebase function, and the calibration flow remains unfulfilled.

Screencast.from.2026-02-08.08-53-49.webm

Proposed Solution

• Replace the hardcoded function URL with an environment variable (e.g., FUNCTIONS_ENDPOINT_URL) that stores the full endpoint URL.
• Add USE_EMULATORS env variable for emulators/firebase url