feat: Implement streaming handlers for live MPEG-TS proxy and VOD HLS transcoding via FFmpeg, and add a release build script.

BUILD.md

@@ -0,0 +1,37 @@
+# How to Build XtremFlow as an Executable
+
+To create a standalone `.exe` version of XtremFlow, you need to build it on your machine.
+
+## Prerequisites
+
+Since you are currently using Docker, you likely don't have these installed on your Windows system yet. You must install them to build the Windows executable.
+
+1.  **Install Flutter SDK**
+    *   Download from: [flutter.dev/install/windows](https://docs.flutter.dev/get-started/install/windows)
+    *   Extract the zip file to `C:\src\flutter` (for example).
+    *   Add `flutter/bin` to your **System PATH**.
+
+2.  **Verify Installation**
+    *   Open a new terminal.
+    *   Run `flutter doctor`.
+    *   Ensure it says "Flutter ... channel stable".
+
+## Building the App
+
+Once Flutter is installed:
+
+1.  Open PowerShell in this folder.
+2.  Run the build script:
+    ```powershell
+    .\build_release.ps1
+    ```
+
+## Adding FFmpeg
+
+1.  After the build finishes, open the new `dist` folder.
+2.  Go to `dist/ffmpeg/bin`.
+3.  Download `ffmpeg.exe` (from [ffmpeg.org](https://ffmpeg.org/download.html)) and place it there.
+
+## Running
+
+Double-click `dist/start.bat` to run the server!