Add FSEQ usermod (SD playback + FPP)

usermods/FSEQ/README.md

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+# ✨ Usermod FSEQ ✨
+
+> **Originally created by: Andrej Chrcek**
+
+Welcome to the **Usermod FSEQ** project!  
+This module extends your WLED setup by enabling FSEQ file playback from an SD card, including a web UI and UDP remote control. It combines creativity with functionality to enhance your lighting experience.
+
+---
+
+# FSEQ Web UI
+
+Access the interface via:
+
+http://yourIP/fsequi
+
+or over the WLED Infotab
+
+<img width="792" height="206" alt="image" src="https://github.com/user-attachments/assets/e58693ec-afe8-4c28-8343-5b3382cd10ef" />
+
+---
+
+# SD & FSEQ Usermod for WLED
+
+This usermod adds support for playing FSEQ files from an SD card and provides a web interface for managing SD files and controlling FSEQ playback via HTTP and UDP.
+
+The usermod exposes several HTTP endpoints for file management and playback control.
+
+---
+
+## Features
+
+- **FSEQ Playback** – Play FSEQ files from an SD card.
+- **Web UI** – Manage SD files (list, upload, delete) and control playback.
+- **UDP Synchronization** – Remote control via UDP packets.
+- **Configurable SPI Pins** – SPI pin assignments can be configured via WLED’s Usermods settings (JSON).
+
+---
+
+## Installation
+
+### Configure PlatformIO
+
+Add the following to your `platformio_override.ini` (or `platformio.ini`):
+
+```ini
+[env:esp32dev_V4]
+custom_usermods = 
+  FSEQ 
+  sd_card
+```
+
+You must add the sd_card usermod also to use the FSEQ usermod.
+
+---
+
+### Storage Configuration
+
+- If you use **SD over SPI**, you must manually set the build flag:  
+  `-D WLED_USE_SD_SPI`  
+
+- If you use **SD via MMC**, you must manually set the build flag:  
+  `-D WLED_USE_SD_MMC`
+
+---
+
+## Available Endpoints
+
+### SD Management
+
+GET /fsequi  
+Returns the main HTML interface for the SD & FSEQ Manager.
+
+GET /api/sd/list  
+Displays an HTML page listing all files on the SD card, including options to delete files and upload new ones.
+
+POST /api/sd/upload  
+Handles file uploads using multipart/form-data.
+
+POST /api/sd/delete
+Deletes the specified file from the SD card.  
+Example: /api/sd/delete 
+body: file=example.fseq
+
+---
+
+### FSEQ Control
+
+GET /api/fseq/list  
+Returns an HTML page listing all .fseq and .FSEQ files found on the SD card. Each file includes a play button.
+
+POST /api/fseq/start
+body: file=animation.fseq  
+Starts playback of the selected FSEQ file.  
+
+POST /api/fseq/startloop
+body: file=animation.fseq  
+Starts playback of the selected FSEQ file in loop mode.  
+
+POST /api/fseq/stop  
+Stops the current FSEQ playback and clears the active session.
+
+---
+
+### FPP Control
+
+GET /api/system/info
+Returns a JSON list of the system info
+
+GET /api/system/status
+Returns a JSON list of the system status
+
+GET /api/fppd/multiSyncSystems
+Returns a JSON list of the multisyncinfos
+
+POST /fpp
+Endpoint for file upload from xLights (raw, application/octet-stream)
+
+GET /fseqfilelist
+Endpoint to list FSEQ files on SD card for FPP Player
+
+GET /fpp/connect
+Endpoint to start FSEQ playback from FPP Player
+
+GET /fpp/stop
+Endpoint to stop FSEQ playback
+
+---
+
+## Summary
+
+The SD & FSEQ Usermod for WLED enables FSEQ playback from an SD card with a full-featured web interface and UDP synchronization. 
+
+For further customization or support, please refer to the project documentation or open an issue on GitHub.