diff --git a/docs/legacy/README.platformio-multi-target.md b/docs/legacy/README.platformio-multi-target.md
new file mode 100644
index 0000000..9c34e3f
--- /dev/null
+++ b/docs/legacy/README.platformio-multi-target.md
@@ -0,0 +1,12 @@
+# Legacy PlatformIO Multi-target Snapshot
+
+`platformio.multi-target.ini` was moved out of the repository root on 2026-03-10.
+
+Rationale:
+- keep `platformio.ini` as the single release entrypoint
+- avoid ambiguous root configs during firmware build/review
+- preserve the old multi-target configuration for reference only
+
+Policy:
+- release and CI must target `platformio.ini` (`freenove_esp32s3_full_with_ui`)
+- do not reintroduce alternate root `platformio*.ini` files
diff --git a/docs/legacy/platformio.multi-target.ini b/docs/legacy/platformio.multi-target.ini
new file mode 100644
index 0000000..44d43aa
--- /dev/null
+++ b/docs/legacy/platformio.multi-target.ini
@@ -0,0 +1,294 @@
+#
+# PlatformIO Project Configuration File (global)
+# Permet de builder tous les firmwares depuis la racine du projet
+#
+[platformio]
+default_envs = freenove_esp32s3_full_with_ui
+src_dir = ui_freenove_allinone
+
+; ===================== ESP32 =====================
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+board_build.partitions = no_ota.csv
+board_build.filesystem = littlefs
+build_src_filter =
+  -<*>
+  +<esp32_audio/src/>
+  +<../libs/story/src/>
+  +<../libs/story/story_engine.cpp>
+  -<../libs/story/src/ui/mp3_ui_model_v2.cpp>
+monitor_speed = 115200
+monitor_filters = time, esp32_exception_decoder
+monitor_echo = yes
+monitor_eol = LF
+monitor_rts = 0
+monitor_dtr = 0
+lib_deps =
+  earlephilhower/ESP8266Audio@^1.9.7
+  https://github.com/pschatzmann/arduino-audio-tools.git#v1.2.2
+  sensorium/Mozzi@^2.0.2
+  https://github.com/pschatzmann/arduino-audio-driver.git#84c7de2eb47efe43bcc769783bb1853ee8a32f21
+  bblanchon/ArduinoJson@^6.21.5
+  https://github.com/me-no-dev/AsyncTCP.git
+  https://github.com/me-no-dev/ESPAsyncWebServer.git
+build_flags =
+  -I$PROJECT_DIR/protocol
+  -Ihardware/firmware/esp32_audio/src
+  -Ihardware/libs/story/src
+  -Ihardware/libs/story
+  -DCORE_DEBUG_LEVEL=1
+  -DUSON_STORY_V2_DEFAULT=1
+  -DUSON_TRACK_CATALOG_MAX_TRACKS=200
+
+; ===================== freenove_esp32s3_full_with_ui =====================
+
+[env:freenove_esp32s3_full_with_ui]
+platform = espressif32@^6.5.0
+# Physical board: ESP32-S3-WROOM-1-N16R8 (16MB flash / 16MB PSRAM)
+board = esp32-s3-devkitc-1
+framework = arduino
+board_build.arduino.memory_type = qio_opi
+board_build.psram_type = opi
+upload_port = /dev/cu.usbmodem5AB907*
+monitor_port = /dev/cu.usbmodem5AB907*
+extra_scripts = pre:scripts/pio_prepare_webui_fonts.py
+board_build.flash_size = 16MB
+board_upload.flash_size = 16MB
+board_upload.maximum_size = 6291456
+board_upload.offset_address = 0x20000
+board_build.partitions = partitions/freenove_esp32s3_app6mb_fs6mb.csv
+board_build.filesystem = littlefs
+build_src_filter =
+  -<*>
+  +<src/>
+  -<src/app/runtime_web_service?2.cpp>
+  -<src/ui/fonts/lv_font_ibmplexmono_bold_12?2.c>
+  -<src/ui/fonts/lv_font_ibmplexmono_italic_24?2.c>
+  -<src/ui/ui_manager_display?2.cpp>
+  -<src/ui/ui_manager_intro?2.cpp>
+  -<src/main.cpp>
+  -<src/scenario_manager.cpp>
+  -<src/ui_manager.cpp>
+  -<src/audio_manager.cpp>
+  -<src/storage_manager.cpp>
+  -<src/camera_manager.cpp>
+  -<src/button_manager.cpp>
+  -<src/touch_manager.cpp>
+  -<src/hardware_manager.cpp>
+  -<src/network_manager.cpp>
+  -<src/media_manager.cpp>
+monitor_speed = 115200
+monitor_filters = time, esp32_exception_decoder
+monitor_echo = yes
+monitor_eol = LF
+monitor_rts = 0
+monitor_dtr = 0
+lib_deps =
+  bodmer/TFT_eSPI@^2.5.43
+  lovyan03/LovyanGFX@^1.2.7
+  lvgl/lvgl@^8.4.0
+  esphome/ESP32-audioI2S@^2.3.0
+  bblanchon/ArduinoJson@^6.21.5
+  adafruit/Adafruit NeoPixel@^1.12.3
+  https://github.com/alvarowolfx/ESP32QRCodeReader.git#dd07abcf062c4c1b120e0584df57c0c92ca77daf
+  https://github.com/codeplea/tinyexpr.git#4a7456e2eab88b4c76053c1c4157639ccb930e2b
+build_flags =
+  -I$PROJECT_DIR/protocol
+  -I$PROJECT_DIR/ui_freenove_allinone/include
+  -I$PROJECT_DIR/lib/zacus_story_portable/include
+  -O2
+  -ffast-math
+  -DCORE_DEBUG_LEVEL=0
+  -DARDUINO_LOOP_STACK_SIZE=16384
+  -DZACUS_SPRINT_DIAG_MODE=1
+  -DBOARD_HAS_PSRAM
+  -DFREENOVE_USE_PSRAM=1
+  -DFREENOVE_PSRAM_UI_DRAW_BUFFER=1
+  -DFREENOVE_PSRAM_CAMERA_FRAMEBUFFER=1
+  -DZACUS_FW_VERSION=\"freenove_esp32s3\"
+  -DUSE_LVGL=1
+  -DUSE_AUDIO=1
+  -DUSE_CAM=1
+  -DUSE_SD=1
+  -DUI_COLOR_256=0
+  -DUI_COLOR_565=1
+  -DUI_FORCE_THEME_256=0
+  -DUI_DRAW_BUF_LINES=16
+  -DUI_DRAW_BUF_IN_PSRAM=1
+  -DUI_AUDIO_RINGBUF_IN_PSRAM=1
+  -DUI_CAMERA_FB_IN_PSRAM=1
+  -DUI_DMA_TX_IN_DRAM=1
+  -DUI_DMA_FLUSH_ASYNC=1
+  -DUI_DMA_RGB332_ASYNC_EXPERIMENTAL=0
+  -DUI_DMA_TRANS_BUF_LINES=1
+  -DUI_ENABLE_SIMD_PATH=1
+  -DUI_SIMD_EXPERIMENTAL=0
+  -DUI_SIMD_USE_ESP_DSP=1
+  -DUI_FULL_FRAME_BENCH=0
+  -DUI_DEMO_AUTORUN_WIN_ETAPE=0
+  -DUI_WIN_ETAPE_SIMPLIFIED=0
+  -DUI_FX_BACKEND_LGFX=1
+  -DUI_FX_DMA_BLIT=0
+  -DUI_BOING_SHADOW_ASM=1
+  -DUI_FX_SPRITE_W=160
+  -DUI_FX_SPRITE_H=120
+  -DUI_FX_TARGET_FPS=12
+  -DFREENOVE_ENABLE_TASK_TOPOLOGY=0
+  -DUI_LV_MEM_SIZE_KB=54
+  -DUI_FONT_PIXEL_ENABLE=1
+  -DUI_FONT_TITLE_XL_ENABLE=1
+  -DUI_ENABLE_MEM_MONITOR=0
+  -DUI_ENABLE_PERF_MONITOR=0
+  -DLV_CONF_INCLUDE_SIMPLE=1
+  -DFREENOVE_MEDIA_KIT
+  -include ui_freenove_config.h
+  -DTFT_RGB_ORDER=TFT_BGR
+  -DFREENOVE_LCD_VARIANT_FNK0102A=0
+  -DFREENOVE_LCD_VARIANT_FNK0102B=0
+  -DFREENOVE_LCD_VARIANT_FNK0102H=1
+  -DFREENOVE_LCD_USE_HSPI=1
+  -DFREENOVE_HAS_TOUCH=0
+
+[env:freenove_esp32s3]
+extends = env:freenove_esp32s3_full_with_ui
+
+[env:freenove_esp32s3_touch]
+extends = env:freenove_esp32s3_full_with_ui
+build_unflags =
+  -DFREENOVE_HAS_TOUCH=0
+build_flags =
+  ${env:freenove_esp32s3_full_with_ui.build_flags}
+  -DFREENOVE_HAS_TOUCH=1
+
+[env:esp32_release]
+extends = env:esp32dev
+build_unflags = -DUSON_STORY_V2_DEFAULT=1
+build_flags = ${env:esp32dev.build_flags} -DUSON_STORY_V2_DEFAULT=0
+
+; =====================  ui_rp2040_ili9488 =====================
+
+[env:ui_rp2040_ili9488]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = rpipico
+framework = arduino
+build_src_filter =
+  -<*>
+  +<ui/rp2040_tft/src/>
+monitor_speed = 115200
+board_build.filesystem = littlefs
+lib_deps =
+  bodmer/TFT_eSPI@^2.5.43
+  paulstoffregen/XPT2046_Touchscreen@0.0.0-alpha+sha.26b691b2c8
+  bblanchon/ArduinoJson@^6.21.5
+  lvgl/lvgl@^8.3.11
+build_flags =
+  -I$PROJECT_DIR/protocol
+  -Ihardware/firmware/ui/rp2040_tft/include
+  -DLV_CONF_INCLUDE_SIMPLE
+  -DUSER_SETUP_LOADED=1
+  -DTFT_MISO=4
+  -DTFT_MOSI=3
+  -DTFT_SCLK=2
+  -DTFT_CS=5
+  -DTFT_DC=6
+  -DTFT_RST=7
+  -DTOUCH_CS=9
+  -DSPI_FREQUENCY=40000000
+  -DSPI_READ_FREQUENCY=20000000
+  -DSPI_TOUCH_FREQUENCY=2500000
+  -DSUPPORT_TRANSACTIONS
+  -DUI_LCD_SPI_HOST=0
+  -DUI_TOUCH_IRQ_PIN=15
+  -DUI_UART_RX_PIN=1
+  -DUI_UART_TX_PIN=0
+  -DUI_SERIAL_BAUD=57600
+  -DUI_ROTATION=1
+  -DILI9488_DRIVER
+  -DTFT_RGB_ORDER=TFT_BGR
+
+
+
+; ===================== (ui_rp2040_ili9486) =====================
+
+[env:ui_rp2040_ili9486]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = rpipico
+framework = arduino
+build_src_filter =
+  -<*>
+  +<ui/rp2040_tft/src/>
+monitor_speed = 115200
+board_build.filesystem = littlefs
+lib_deps =
+  bodmer/TFT_eSPI@^2.5.43
+  paulstoffregen/XPT2046_Touchscreen@0.0.0-alpha+sha.26b691b2c8
+  bblanchon/ArduinoJson@^6.21.5
+  lvgl/lvgl@^8.3.11
+build_flags =
+  -I$PROJECT_DIR/protocol
+  -Ihardware/firmware/ui/rp2040_tft/include
+  -DLV_CONF_INCLUDE_SIMPLE
+  -DUSER_SETUP_LOADED=1
+  -DFREENOVE_MEDIA_KIT
+  -include ui_freenove_config.h
+  -DFREENOVE_LCD_WIDTH=480
+  -DFREENOVE_LCD_HEIGHT=320
+  -DFREENOVE_TFT_CS=5
+  -DFREENOVE_TFT_DC=6
+  -DFREENOVE_TFT_RST=7
+  -DFREENOVE_TFT_MOSI=3
+  -DFREENOVE_TFT_MISO=4
+  -DFREENOVE_TFT_SCK=2
+  -DFREENOVE_TOUCH_CS=9
+  -DFREENOVE_TOUCH_IRQ=15
+  -DFREENOVE_UART_TX=0
+  -DFREENOVE_UART_RX=1
+  -DFREENOVE_LCD_ROTATION=1
+  -DSPI_FREQUENCY=40000000
+  -DSPI_READ_FREQUENCY=20000000
+  -DSPI_TOUCH_FREQUENCY=2500000
+  -DSUPPORT_TRANSACTIONS
+  -DUI_LCD_SPI_HOST=0
+  -DUI_SERIAL_BAUD=57600
+  -DUI_ROTATION=1
+  -DILI9488_DRIVER
+  -DTFT_RGB_ORDER=TFT_BGR
+
+; ===================== ESP8266 OLED =====================
+
+[env:esp8266_oled]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+build_src_filter =
+  -<*>
+  +<ui/esp8266_oled/src/>
+monitor_speed = 115200
+monitor_filters = time, colorize, esp8266_exception_decoder
+monitor_echo = yes
+monitor_eol = LF
+monitor_rts = 0
+monitor_dtr = 0
+lib_deps =
+  adafruit/Adafruit SSD1306@^2.5.13
+  adafruit/Adafruit GFX Library@^1.12.1
+  plerup/EspSoftwareSerial@^8.2.0
+  olikraus/U8g2@^2.36.2
+  bblanchon/ArduinoJson@^6.21.5
+build_flags =
+  -Iprotocol
+
+#
+# Pour builder tous les firmwares :
+#   pio run
+# Pour builder un firmware spécifique :
+#   pio run -e <nom_env>
+# Pour flasher/monitorer :
+#   pio run -e <env> -t upload --upload-port <PORT>
+#   pio device monitor -e <env> --port <PORT>
+#
+# Voir docs/protocols/ pour la documentation centralisée
+#