Move RYMCU BigSmart under manufacturer directory

Create main/boards/rymcu/bigsmart so future RYMCU boards can live under the same manufacturer directory. Update CMake to set MANUFACTURER to rymcu while preserving BOARD_NAME as rymcu-bigsmart, and adjust config.json so release output remains rymcu-bigsmart.

main/CMakeLists.txt

@@ -159,7 +159,9 @@ elseif(CONFIG_BOARD_TYPE_LICHUANG_DEV_C3)
     set(BUILTIN_ICON_FONT font_awesome_20_4)
     set(DEFAULT_EMOJI_COLLECTION twemoji_32)
 elseif(CONFIG_BOARD_TYPE_RYMCU_BIGSMART)
-    set(BOARD_TYPE "rymcu-bigsmart")
+    set(MANUFACTURER "rymcu")
+    set(BOARD_TYPE "bigsmart")
+    set(BOARD_NAME "rymcu-bigsmart")
     set(BUILTIN_TEXT_FONT font_noto_basic_20_4)
     set(BUILTIN_ICON_FONT font_awesome_20_4)
     set(DEFAULT_EMOJI_COLLECTION noto-emoji_128)

main/boards/rymcu/bigsmart/config.json

@@ -1,8 +1,9 @@
 {
+    "manufacturer": "rymcu",
     "target": "esp32s3",
     "builds": [
         {
-            "name": "rymcu-bigsmart",
+            "name": "bigsmart",
             "sdkconfig_append": [
                 "CONFIG_USE_DEVICE_AEC=y"
             ]