Add dynamic ports warning to SRT Listener mode documentation

[Copilot]

Applied Changes to Refactoring Branch

Successfully moved the dynamic ports warning implementation to the refactoring branch as requested.

Changes completed:

• Switched to refactoring branch (Astro/Starlight framework)
• Added dynamic ports warning to SRT Listener mode section
• Used proper Astro syntax: :::danger[Port Selection Warning]
• Maintained technical accuracy: /proc/sys/net/ipv4/ip_local_port_range default 32768-60999
• Explained conflicts with SRT Caller mode and other outgoing connections
• Verified build and UI display work correctly
• Confirmed warning appears prominently in the Listener mode section

Technical details:

• Framework: Astro with Starlight documentation theme (instead of Nuxt)
• Alert syntax: :::danger[Port Selection Warning] (instead of ::alert{type="warning"})
• File location: src/content/docs/en/astra/receiving/srt.md
• Language support: English only in refactoring branch (as that's what currently exists)

Screenshot:

The warning now appears correctly in the refactoring branch with the proper danger-level styling and is positioned right after the port parameter descriptions in the Listener mode section.

Addresses @and-cesbo's request to work with the refactoring branch instead of master/main.

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[and-cesbo]

@copilot ты можешь работать с другими ветками, не с master? изменения нужны в ветке refactoring

[Copilot]

@copilot ты можешь работать с другими ветками, не с master? изменения нужны в ветке refactoring

Yes, I can work with the refactoring branch! I've successfully switched to it and applied the dynamic ports warning there. The refactoring branch uses Astro/Starlight instead of Nuxt, so I adapted the warning syntax accordingly (:::danger instead of ::alert). The changes are now in src/content/docs/en/astra/receiving/srt.md and the warning displays correctly. Commit: c43f281