Add accent-insensitive search module

[eDuSHMix]

Summary

Adds an XDJ-RX3 firmware 1.19 module that makes SEARCH insensitive to common Latin accents.

Examples:

• NINO finds NIÑO
• CANCION finds CANCIÓN
• CORAZON finds CORAZÓN
• MUSICA finds MÚSICA
• PINGUINO finds PINGÜINO

Displayed track metadata is unchanged. The normalization only affects the SEARCH comparison path.

Technical details

• Target: XDJ-RX3 firmware 1.19
• Stock rbp SHA1: cf309238491e73cdbdc1f08a09f7a3177e079068
• Search normalization routine: shape() at 0x001644FC
• The stock routine uppercases ASCII a-z
• This patch extends that normalization for common accented Latin characters and Ñ
• Implemented using guarded register_patch entries
• No persistent firmware/storage modification

Validation

Tested on real XDJ-RX3 hardware running firmware 1.19.

Confirmed:

• NINO -> NIÑO
• CANCION -> CANCIÓN
• CORAZON -> CORAZÓN
• MUSICA -> MÚSICA
• PINGUINO -> PINGÜINO
• Normal ASCII searches continue to work
• rbp restarts successfully
• Power cycling without the mod restores stock behavior

Local validation:

• make hook
• make test
• make preflight

All completed successfully.