Add publish settings and adjust .gitignore

Enabled single-file publishing in Server.csproj and included new IntelliJ IDEA configuration files for Git. Adjusted .gitignore to include publish directory.

.gitignore

@@ -35,4 +35,5 @@ Desktop.ini
 
 /Server/Customers.json
 /Server/Settings.json
-/Server/invoices/
+/Server/invoices/
+/Server/publish/

.idea/.idea.TinyInvoice/.idea/git_toolbox_prj.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GitToolBoxProjectSettings">
+    <option name="commitMessageIssueKeyValidationOverride">
+      <BoolValueOverride>
+        <option name="enabled" value="true" />
+      </BoolValueOverride>
+    </option>
+    <option name="commitMessageValidationEnabledOverride">
+      <BoolValueOverride>
+        <option name="enabled" value="true" />
+      </BoolValueOverride>
+    </option>
+  </component>
+</project>

.idea/.idea.TinyInvoice/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

Server/Server.csproj

@@ -4,14 +4,11 @@
         <TargetFramework>net8.0</TargetFramework>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
+        <PublishSingleFile>true</PublishSingleFile>
     </PropertyGroup>
 
     <ItemGroup>
       <PackageReference Include="QuestPDF" Version="2024.10.2" />
     </ItemGroup>
-
-    <ItemGroup>
-      <None Remove="Invoice.pdf" />
-    </ItemGroup>
-
+    
 </Project>