Add dotnet-tools.json and publish script for .NET 8

Added a `dotnet-tools.json` file to define a .NET tool manifest, specifying the `dotnet-ef` tool with version `10.0.9`.

Introduced a `publish.bat` script for publishing the `EnvelopeGenerator.Server` project as a self-contained application targeting `win-x64` and .NET 8. The script handles cleaning, publishing, output verification, and provides deployment instructions for IIS.

Updated the `EnvelopeGenerator.sln` file to include a reference to the `publish.bat` script under the `EnvelopeGenerator.Server` project using a `SolutionItems` section.

EnvelopeGenerator.Server/EnvelopeGenerator.Server/dotnet-tools.json

@@ -0,0 +1,13 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-ef": {
+      "version": "10.0.9",
+      "commands": [
+        "dotnet-ef"
+      ],
+      "rollForward": false
+    }
+  }
+}

EnvelopeGenerator.Server/publish.bat

@@ -0,0 +1,96 @@
+@echo off
+setlocal
+
+echo ============================================================
+echo  EnvelopeGenerator.Server - Self-Contained Publish
+echo  Target: win-x64 / .NET 8 / Release
+echo ============================================================
+echo.
+
+REM Must be run from the solution root directory.
+REM This file is located under: EnvelopeGenerator.Server\
+
+set PROJECT=EnvelopeGenerator.Server\EnvelopeGenerator.Server.csproj
+set OUTPUT=publish-output
+set RID=win-x64
+set FRAMEWORK=net8.0
+
+echo [1/3] Cleaning previous publish output...
+if exist "%OUTPUT%" (
+    rmdir /s /q "%OUTPUT%"
+    echo       Removed: %OUTPUT%
+) else (
+    echo       Nothing to clean.
+)
+echo.
+
+echo [2/3] Publishing...
+echo       Project  : %PROJECT%
+echo       Output   : %OUTPUT%
+echo       RID      : %RID%
+echo       Framework: %FRAMEWORK%
+echo.
+
+dotnet publish "%PROJECT%" ^
+  -c Release ^
+  -f %FRAMEWORK% ^
+  --self-contained true ^
+  --runtime %RID% ^
+  -o "%OUTPUT%"
+
+if %ERRORLEVEL% neq 0 (
+    echo.
+    echo [ERROR] Publish failed! ERRORLEVEL=%ERRORLEVEL%
+    pause
+    exit /b %ERRORLEVEL%
+)
+
+echo.
+echo [3/3] Verifying output...
+
+set PASS=1
+
+if not exist "%OUTPUT%\EnvelopeGenerator.Server.exe" (
+    echo [FAIL] EnvelopeGenerator.Server.exe not found!
+    set PASS=0
+)
+if not exist "%OUTPUT%\hostfxr.dll" (
+    echo [FAIL] hostfxr.dll not found! (Not a self-contained publish?)
+    set PASS=0
+)
+if not exist "%OUTPUT%\coreclr.dll" (
+    echo [FAIL] coreclr.dll not found! (Not a self-contained publish?)
+    set PASS=0
+)
+if not exist "%OUTPUT%\Microsoft.Extensions.DependencyInjection.Abstractions.dll" (
+    echo [FAIL] Microsoft.Extensions.DependencyInjection.Abstractions.dll not found!
+    set PASS=0
+)
+if not exist "%OUTPUT%\web.config" (
+    echo [FAIL] web.config not found!
+    set PASS=0
+)
+
+if "%PASS%"=="1" (
+    echo.
+    echo ============================================================
+    echo  PUBLISH SUCCEEDED
+    echo  Output folder: %~dp0%OUTPUT%
+    echo ============================================================
+    echo.
+    echo Next steps:
+    echo   1. Copy the contents of '%OUTPUT%' to the IIS application directory
+    echo   2. Set the IIS Application Pool to 'No Managed Code'
+    echo   3. Recycle the Application Pool
+    echo.
+) else (
+    echo.
+    echo ============================================================
+    echo  PUBLISH COMPLETED BUT VERIFICATION FAILED
+    echo  Review the FAIL messages above.
+    echo ============================================================
+    echo.
+)
+
+pause
+endlocal