docs: add firmware upload guide and translate platformio.ini comments

- Add FIRMWARE_UPLOAD.md with PlatformIO upload instructions
- Translate platformio.ini comments to English
- Remove redundant comments from platformio.ini

FIRMWARE_UPLOAD.md

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+# Upload Guide from Cursor
+
+## Installing PlatformIO
+
+1. **Install PlatformIO extension in Cursor**:
+   - Open extensions (Cmd+Shift+X / Ctrl+Shift+X)
+   - Search for "PlatformIO IDE"
+   - Install the official extension
+
+2. **Wait for installation**:
+   - PlatformIO will automatically install necessary tools
+   - This may take a few minutes the first time
+
+## Serial Port Configuration
+
+1. **Connect your ESP32-S3** via USB
+2. **Identify the port**:
+   - macOS: `/dev/cu.usbserial-*` or `/dev/cu.usbmodem*`
+   - Windows: `COM3`, `COM4`, etc.
+   - Linux: `/dev/ttyUSB0` or `/dev/ttyACM0`
+
+3. **Uncomment and modify the line in `platformio.ini`**:
+   ```ini
+   upload_port = /dev/cu.usbserial-XXXX  ; Replace with your port
+   ```
+
+## Firmware Upload
+
+### Method 1: Via PlatformIO Toolbar
+
+1. Click on the **PlatformIO** icon in the left sidebar
+2. In **PROJECT TASKS** → **esp32-s3-devkitc-1**
+3. Click **Upload** (or **Build and Upload**)
+
+### Method 2: Via Command Palette
+
+1. Open command palette (Cmd+Shift+P / Ctrl+Shift+P)
+2. Type "PlatformIO: Upload"
+3. Select the `esp32-s3-devkitc-1` environment
+
+### Method 3: Via Integrated Terminal
+
+```bash
+pio run --target upload
+```
+
+## LittleFS Filesystem Upload
+
+**IMPORTANT**: After uploading the firmware, you must also upload the files from the `data/` folder (index.html, index.js, etc.)
+
+### Via Command Palette
+
+1. Command palette (Cmd+Shift+P / Ctrl+Shift+P)
+2. Type "PlatformIO: Upload Filesystem Image"
+3. Select the `esp32-s3-devkitc-1` environment
+
+### Via Terminal
+
+```bash
+pio run --target uploadfs
+```
+
+## Verification
+
+1. **Open serial monitor**:
+   - Command palette → "PlatformIO: Serial Monitor"
+   - Or PlatformIO icon → **Monitor**
+
+2. **Check messages**:
+   - You should see "Startup/Boot...."
+   - And "File system mounted successfully"
+
+3. **Connect to web interface**:
+   - Look for IP address in serial logs
+   - Or connect to WiFi "ESPSomfy RTS" if in AP mode
+
+## Troubleshooting
+
+### "Port not found" Error
+- Verify ESP32 is properly connected
+- Check port in `platformio.ini`
+- On macOS/Linux, you may need permissions: `sudo chmod 666 /dev/cu.usbserial-*`
+
+### Compilation Error
+- Verify all libraries are installed
+- PlatformIO installs them automatically, but you can force: `pio lib install`
+
+### Filesystem Won't Upload
+- Make sure firmware was uploaded first
+- Verify the `data/` folder exists
+- Some boards require manual reset before filesystem upload

platformio.ini

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+[env:esp32-s3-devkitc-1]
+platform = espressif32
+board = esp32-s3-devkitc-1
+framework = arduino
+monitor_speed = 115200
+upload_speed = 921600
+
+; Partition scheme with LittleFS
+board_build.partitions = default.csv
+board_build.filesystem = littlefs
+
+; Required libraries
+lib_deps = 
+    bblanchon/ArduinoJson@^6.21.3
+    https://github.com/LSatan/SmartRC-CC1101-Driver-Lib.git
+    knolleary/PubSubClient@^2.8
+    links2004/WebSockets@^2.4.1
+
+; Build options
+build_flags = 
+    -DCORE_DEBUG_LEVEL=3
+
+; Serial port (adjust according to your system)
+upload_port = /dev/cu.usbmodem101  ; macOS - ESP32-S3 detected
+monitor_port = /dev/cu.usbmodem101
+; upload_port = COM3                 ; Windows
+; upload_port = /dev/ttyUSB0         ; Linux