Radio Galaxy FX parity pass

Base used:
- Radio Galaxy FX build

Reference used:
- Smurfettes build

What was done:
- Kept Galaxy styling, assets, theme, and existing Galaxy page presentation intact
- Added only missing parity support files from Smurfettes
- Did not replace Galaxy CSS, images, backgrounds, nav art, or public theme styling
- Cleaned remaining obvious public-facing Smurf station wording to Radio Galaxy FX

Added from reference:
- stream-proxy.php
- data/icecast_stats_cache.json
- data/schedule.txt
- data/top50.json
- data/top50_state.json
- data/visitors_online.json

Branding cleanups:
- chat page text updated to Radio Galaxy FX wording
- chat browser storage key updated to radiogalaxyfx_chat_name
- removed Smurfies autodj names from settings.json
