feat(serwersms): add group messaging support

[MkDev11]

📝 Summary of changes done and why they are done

Adds group messaging support to the SerwerSMS notification provider.

Currently, SerwerSMS only allows sending notifications to a single phone number. However, the SerwerSMS API already supports sending messages to predefined groups. This change exposes that capability in the UI, letting users choose whether to send to a phone number or a group.

What changed:

• Added a "Recipient type" dropdown with options for "Phone number" (default) or "Group"
• The phone number field appears when "Phone number" is selected
• A new group ID field appears when "Group" is selected
• Backend conditionally sends either the phone or group parameter to the API

This is a non-breaking change — existing notifications using phone numbers continue to work as before.

📋 Related issues

• Resolves SerwerSMS (notification provider) Adding Group Messaging Functionality #6000

📄 Checklist

Please follow this checklist to avoid unnecessary back and forth (click to expand)

• ⚠️ If there are Breaking change (a fix or feature that alters existing functionality in a way that could cause issues) I have called them out
• 🧠 I have disclosed any use of LLMs/AI in this contribution and reviewed all generated content.
  I understand that I am responsible for and able to explain every line of code I submit.
• 🔍 My code adheres to the style guidelines of this project.
• ⚠️ My changes generate no new warnings.
• 🛠️ I have reviewed and tested my code.
• 📝 I have commented my code, especially in hard-to-understand areas (e.g., using JSDoc for methods).
• 🤖 I added or updated automated tests where appropriate.
• 📄 Documentation updates are included (if applicable).
• 🔒 I have considered potential security impacts and mitigated risks.
• 🧰 Dependency updates are listed and explained.

📷 Screenshots or Visual Changes

• UI Modifications: Added recipient type dropdown and conditional group ID field
  | Phone number | Group |
  |--------------|-------|
  | | |

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Files changed:

• server/notification-providers/serwersms.js — Backend logic to send group param when group is selected
• src/components/notifications/SerwerSMS.vue — UI with recipient type dropdown and conditional fields
• src/lang/en.json — Added translation keys for new UI elements

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Contribution by Gittensor, see my contribution statistics at https://gittensor.io/miners/details?githubId=94194147

[MkDev11]

@louislam @CommanderStorm Please review the PR and let me know your feedbacks.

[CommanderStorm]

Code LGTM.
Could you share a screenshot of a notification being send succssfully to a group?

We can merge if I have a screenshot that it works 😉
This is especailly since https://dev.serwersms.pl/en/https-api-v2/sending-sms-messages-with-the-same-content does not show the group key only group_id

[MkDev11]

Code LGTM. Could you share a screenshot of a notification being send succssfully to a group?

We can merge if I have a screenshot that it works 😉 This is especailly since https://dev.serwersms.pl/en/https-api-v2/sending-sms-messages-with-the-same-content does not show the group key only group_id

Since the platform requires a company email address, it's hard for me to share the screenshot.

[CommanderStorm]

Since the docs are fairly good on this one, I am inclided to accept it without the usual screenshot that we require for all notification providers

[Copilot]

Pull request overview

This PR adds group messaging support to the SerwerSMS notification provider, allowing users to send notifications to predefined groups in addition to individual phone numbers. This is a non-breaking enhancement that maintains backward compatibility with existing phone number-based notifications.

Key changes:

• Added UI toggle between "Phone number" and "Group" recipient types
• Conditional form fields display appropriate input based on selection
• Backend logic sends either phone or group_id parameter to the API accordingly

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/lang/en.json	Added translation keys for recipient type selector and group ID field with help text
src/components/notifications/SerwerSMS.vue	Added recipient type dropdown and conditional rendering for phone number vs group ID input fields
server/notification-providers/serwersms.js	Updated backend logic to conditionally send phone or group_id parameter based on recipient type