frontend: components: DHCPServerDialog: Add alert for Backup Server

[patrickelectric]

Fix #3547

Summary by Sourcery

New Features:

• Display an informational alert explaining how the DHCP backup server behaves when enabled.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds an informational alert to the DHCPServerDialog explaining the behavior when the Backup Server option is enabled, improving user understanding of backup server behavior.

File-Level Changes

Change	Details	Files
Add an informational alert below the Backup Server switch explaining backup server behavior.	Insert a Vuetify v-alert component configured as dense, text, and type='info' Place the alert immediately under the Backup Server v-switch within the dialog layout Set the alert message to clarify that the DHCP server remains inactive and only serves IPs when no other DHCP server is detected	core/frontend/src/components/ethernet/DHCPServerDialog.vue

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3547	Add in-UI documentation/description explaining how the Backup DHCP Server behaves in BlueOS.	✅

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[sourcery-ai]

Hey - I've left some high level feedback:

• The informational alert text is hardcoded in English; consider using the existing i18n / localization mechanism used elsewhere in the frontend so the message can be translated.
• The alert is always shown even when is_backup_server is false; consider conditionally rendering it (e.g. v-if="is_backup_server") so the message only appears when the backup server option is enabled.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The informational alert text is hardcoded in English; consider using the existing i18n / localization mechanism used elsewhere in the frontend so the message can be translated.
- The alert is always shown even when `is_backup_server` is false; consider conditionally rendering it (e.g. `v-if="is_backup_server"`) so the message only appears when the backup server option is enabled.

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