Initialize PlatformIO project and VS Code setup

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

platformio.ini

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+[env:m5stack-papers3]
+platform = espressif32
+board = esp32s3box
+framework = arduino
+src_dir = src
+
+; Exclude the built-in Arduino WebServer framework library — it depends on
+; WiFiServer.h which was moved in ESP32 Arduino 3.x. We use ESPAsyncWebServer
+; instead, so the built-in WebServer is never needed.
+lib_ignore = WebServer
+
+; M5Stack PaperS3: ESP32-S3FN16R8 (16MB Flash, 8MB OPI PSRAM)
+board_build.flash_size = 16MB
+board_build.partitions = default_16MB.csv
+board_build.arduino.memory_type = qio_opi
+board_build.f_cpu = 240000000L
+
+build_flags =
+    -DARDUINO_USB_MODE=1
+    -DARDUINO_USB_CDC_ON_BOOT=1
+    -DCORE_DEBUG_LEVEL=0
+    ; NimBLE config - minimise memory footprint per CLAUDE.md
+    -DCONFIG_BT_NIMBLE_ROLE_BROADCASTER=0
+    -DCONFIG_BT_NIMBLE_ROLE_PERIPHERAL=0
+    -DCONFIG_BT_NIMBLE_MAX_CONNECTIONS=1
+
+lib_deps =
+    ; Display & Core System
+    m5stack/M5Unified
+    m5stack/M5GFX
+    ; Bluetooth (low-memory NimBLE)
+    h2zero/NimBLE-Arduino
+    ; GPS Parsing
+    mikalhart/TinyGPSPlus
+    ; Web Server (ESP32-S3 compatible fork + async TCP)
+    mathieucarbou/ESPAsyncWebServer
+    mathieucarbou/AsyncTCP
+    ; FTP server for management AP file access
+    xreef/SimpleFTPServer
+
+monitor_speed = 115200
+monitor_filters = esp32_exception_decoder