feat: Migrate Node-1st-gen samples from functions.config to params

[google-labs-jules]

This change migrates all Cloud Functions for Firebase samples in the Node-1st-gen folder from the deprecated functions.config() API to the new params API.

The following changes were made:

• Replaced functions.config() with defineString for non-sensitive configuration and defineSecret for sensitive values like API keys and passwords.
• Updated function definitions to use runWith({secrets: [...]}) to grant them access to the defined secrets at runtime.
• Refactored the code to move the initialization of API clients (e.g., for Stripe, PayPal, Algolia, Nodemailer) from the global scope into the function handlers. This is necessary because parameter values are only accessible at runtime.
• Updated all relevant README.md files to replace firebase functions:config:set commands with the new instructions for either creating a .env file or using firebase functions:secrets:set.
• Updated all code comments that referred to the old functions.config() variables.

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PR created automatically by Jules for task 6616826145812791659 started by @jhuleatt

[google-labs-jules]

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[jhuleatt]

keep this initialization global as it used to be. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of elastic client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn

[jhuleatt]

use one global instance of this client instead of initializing each time the function runs. In order to access param values, you need to do this inside of an onInit hook https://firebase.google.com/docs/functions/config-env#init-fn