[Feature] mcPrefix formatting code for FTB Ranks Color

**Reported By**: `Cubr (_cubr1)`
**Original Message**: [View On Discord](https://discord.com/channels/750990873311051786/1401288876290474074/1401302344376778874)

**Issue Description**:
I was wondering if you can make the text after "[Discord]" to be the same color as what the FTB Ranks rank-color is

***

**Additional Information (Added by HypherionSA)**:
This would require a linked account, and a new placeholder would have to be added.

Need to decide on falling back to the discord role color, or allowing a custom fallback when no color is found. This would possibly be implemented as a MiniMessage flag

No files or tests are named. Start by reviewing the linked-account and MiniMessage placeholder or flag handling related to FTB Ranks and Discord role colors; the design must first settle the fallback behavior. Done means text after "[Discord]" uses the FTB Ranks rank color, with the agreed fallback when no color is available.

Written by the indexing model from the issue text.