feat(layout): 좌측하단 내비게이션 드로어에 버전 정보 및 배포 일시 추가 및 빌드 자동화 연계

src/dotnet/QuantEngine.Web/Components/Layout/MainLayout.razor

@@ -1,4 +1,5 @@
-@inherits LayoutComponentBase
+@inherits LayoutComponentBase
+@inject Microsoft.AspNetCore.Hosting.IWebHostEnvironment WebHostEnvironment
 
 <MudLayout>
     <MudAppBar Elevation="1">
@@ -9,11 +10,19 @@
         <MudIconButton Icon="@Icons.Material.Filled.Settings" Color="Color.Inherit" />
     </MudAppBar>
 
-    <MudDrawer @bind-Open="@drawerOpen" Elevation="1">
+    <MudDrawer @bind-Open="@drawerOpen" Elevation="1" Class="d-flex flex-column h-100">
         <MudDrawerHeader>
             <MudText Typo="Typo.h6">Menu</MudText>
         </MudDrawerHeader>
+        
         <NavMenu />
+        
+        <MudSpacer />
+        
+        <div class="px-4 py-3 mt-auto" style="border-top: 1px solid rgba(0,0,0,0.08); font-size: 11px; color: var(--mud-palette-text-secondary); line-height: 1.5; background-color: rgba(0,0,0,0.01);">
+            <div style="font-weight: 500; margin-bottom: 2px;">QuantEngine v@appVersion</div>
+            <div style="font-size: 10px; opacity: 0.85;">배포: @buildTime</div>
+        </div>
     </MudDrawer>
 
     <MudMainContent>
@@ -32,9 +41,39 @@
 
 @code {
     private bool drawerOpen = true;
+    private string appVersion = "Local Debug";
+    private string buildTime = "N/A";
 
     private void DrawerToggle()
     {
         drawerOpen = !drawerOpen;
     }
+
+    protected override void OnInitialized()
+    {
+        try
+        {
+            var versionFilePath = Path.Combine(WebHostEnvironment.WebRootPath, "version.json");
+            if (File.Exists(versionFilePath))
+            {
+                var jsonContent = File.ReadAllText(versionFilePath);
+                using var doc = System.Text.Json.JsonDocument.Parse(jsonContent);
+                var root = doc.RootElement;
+                
+                if (root.TryGetProperty("version", out var versionProp))
+                {
+                    appVersion = versionProp.GetString() ?? "Local Debug";
+                }
+                if (root.TryGetProperty("built", out var builtProp))
+                {
+                    buildTime = builtProp.GetString() ?? "N/A";
+                }
+            }
+        }
+        catch
+        {
+            // Fail-safe default fallback values
+        }
+    }
 }
+