refactor: project menus from entry attributes

Author: Hongwei-MB

src/Modules/Home/Home.UI.Avalonia/HomeAvaloniaModule.cs

@@ -10,7 +10,7 @@ namespace Modulus.Modules.Home.UI.Avalonia;
 /// Home Module Avalonia UI - declares Avalonia-specific navigation.
 /// </summary>
 [DependsOn(typeof(HomeModule))]
-[AvaloniaMenu("Home", typeof(HomeViewModel), Icon = IconKind.Home, Order = 1)]
+[AvaloniaMenu("home", "Home", typeof(HomeViewModel), Icon = IconKind.Home, Order = 1)]
 public class HomeAvaloniaModule : AvaloniaModuleBase
 {
     public override async Task OnApplicationInitializationAsync(IModuleInitializationContext context, CancellationToken cancellationToken = default)

src/Modules/Home/Home.UI.Blazor/HomeBlazorModule.cs

@@ -9,7 +9,7 @@ namespace Modulus.Modules.Home.UI.Blazor;
 /// Home Module Blazor UI - declares Blazor-specific navigation.
 /// </summary>
 [DependsOn(typeof(HomeModule))]
-// Menu is declared in extension.vsixmanifest, no [BlazorMenu] needed here
+[BlazorMenu("home", "Home", "/home", Icon = IconKind.Home, Order = 1)]
 public class HomeBlazorModule : ModulusPackage
 {
     public override Task OnApplicationInitializationAsync(IModuleInitializationContext context, CancellationToken cancellationToken = default)

src/Modulus.Core/Installation/ModuleInstallerService.cs

@@ -115,6 +115,8 @@ public async Task InstallFromPathAsync(string packagePath, bool isSystem = false
             }
         }
 
+        var moduleLocation = (isSystem && requestedBottom) ? MenuLocation.Bottom : MenuLocation.Main;
+
         // Compute manifest hash for change detection
         var manifestHash = await VsixManifestReader.ComputeHashAsync(manifestPath, cancellationToken);
 
@@ -132,6 +134,10 @@ public async Task InstallFromPathAsync(string packagePath, bool isSystem = false
             ? null
             : JsonSerializer.Serialize(validationResult.Errors);
 
+        var existing = await _moduleRepository.GetAsync(identity.Id, cancellationToken);
+        var isEnabled = existing?.IsEnabled ?? validationResult.IsValid;
+        if (!validationResult.IsValid) isEnabled = false;
+
         var moduleEntity = new ModuleEntity
         {
             Id = identity.Id,
@@ -146,7 +152,7 @@ public async Task InstallFromPathAsync(string packagePath, bool isSystem = false
             ManifestHash = manifestHash,
             ValidatedAt = DateTime.UtcNow,
             IsSystem = isSystem,
-            IsEnabled = preserveIsEnabled,
+            IsEnabled = isEnabled,
             MenuLocation = moduleLocation,
             State = moduleState,
             ValidationErrors = validationErrors