Add RetroPie configs backup from /opt/retropie/configs

키 설정·패드 매핑·에뮬 설정을 sync-configs.sh로 동기화.

Co-authored-by: Cursor <cursoragent@cursor.com>

configs/dreamcast/mappings/controller_generic.cfg

@@ -0,0 +1,31 @@
+[emulator]
+mapping_name = Generic Controller
+btn_escape = 0x13a
+btn_savestate = 0x3c
+btn_loadstate = 0x3e
+
+[dreamcast]
+btn_a = 0x130
+btn_b = 0x131
+btn_c = 0x132
+btn_d = 0x13d
+btn_x = 0x133
+btn_y = 0x134
+btn_z = 0x135
+btn_start = 0x13b
+btn_dpad1_left = 0x220
+btn_dpad1_right = 0x221
+btn_dpad1_up = 0x222
+btn_dpad1_down = 0x223
+axis_x = 0x00
+axis_y = 0x01
+axis_trigger_left = 0x02
+axis_trigger_right = 0x05
+
+[compat]
+btn_trigger_left = 0x136
+btn_trigger_right = 0x137
+axis_dpad1_x = 0x10
+axis_dpad1_y = 0x11
+axis_dpad2_x = 0x12
+axis_dpad2_y = 0x13