Creat GUI project framework.

AGENTS.md

@@ -3,23 +3,29 @@
 ## Build & Test
 
 ```bash
-dotnet build              # Build all projects
+dotnet build                                            # Build all projects
-dotnet test               # Run all tests
+dotnet test                                             # Run all tests
 dotnet test --filter "FullyQualifiedName~ClassName.MethodName"  # Run single test
+dotnet run --project src/GUI                            # Launch the Avalonia desktop app
 ```
 
 ## Architecture
 
-- **3-project solution** (`src/Resonance.sln`):
+- **4-project solution** (`src/Resonance.sln`):
   - `Core` — class library: audio file scanning, metadata reading (ATL), SQLite persistence (Dapper)
   - `Core.Tests` — xUnit + FluentAssertions + Moq
-  - `AtlFieldExtractor` — CLI that dumps ATL metadata fields from WAV files to `.atl.txt`
+  - `AtlFieldExtractor` — CLI that dumps ATL metadata fields from WAV files to `.atl.txt` to test ATL library
-- **No Avalonia UI yet** — README mentions it but only the Core library exists.
+  - `GUI` — Avalonia 12 desktop app: audio asset management UI
+- **MVVM architecture** (GUI project):
+  - Based on **CommunityToolkit.Mvvm** v8.4.1 — source-generator-driven MVVM toolkit.
+  - Base class: `ViewModelBase` (abstract, extends `ObservableObject`). Use `[ObservableProperty]` for bindable properties, `[RelayCommand]` for commands, and `SetProperty<T>()` for manual property change notification.
+  - View-ViewModel binding: `ViewLocator` implements `IDataTemplate` — convention-based resolution by replacing `"ViewModel"` with `"View"` in the type name (e.g., `MainWindowViewModel` → looks for `MainWindow` in `GUI.Views`). Uses `Activator.CreateInstance()`; **no DI container** is configured.
+  - Compiled bindings are enabled by default (`AvaloniaUseCompiledBindingsByDefault=true` in `.csproj`). Annotate XAML with `x:DataType="vm:MyViewModel"` for compile-time validation.
+  - `App.axaml` applies `FluentTheme` and registers `ViewLocator` globally. `App.axaml.cs` manually instantiates `MainWindow` → `MainWindowViewModel` in `OnFrameworkInitializationCompleted`.
 - Target framework: `net10.0` (requires .NET 10 SDK — currently `10.0.103`).
 
 ## Known Issues / Gotchas
 
-- **Table name mismatch**: `Database.InitializeDatabase()` creates table `sounds`, but `AddEntry()` / `AddEntries()` / `EntryExists()` reference `audio_files`. Any call to insert or query will fail at runtime. `Database` currently has no test coverage.
 - **Tests create temp files/directories** under `Path.GetTempPath()` and clean them up via `IDisposable`. Don't rely on a real audio directory for tests.
 - **`AudioMetadataReader` tests** use real WAV files from `data/source/` (not in git). When files are absent, tests silently return early (`if (wavFiles.Length == 0) return;`) — they pass without actually running assertions, not `Skip.If`. Running `dotnet test` will report 12 passes regardless of whether the fixture files exist.
 - **`.atl.txt` fixture files** are generated by `AtlFieldExtractor`. If the WAV files or the ATL library version change, re-run the extractor to regenerate them before running metadata tests.
@@ -35,7 +41,7 @@ dotnet test --filter "FullyQualifiedName~ClassName.MethodName"  # Run single tes
 ## Conventions
 
 - Code and comments are in **Chinese**.
-- Namespace: `OCES.Resonance.Core` (Core), `OCES.Resonance.AtlFieldExtractor` (extractor), `OCES.Resonance.Core.Tests` (tests).
+- Namespace: `OCES.Resonance.Core` (Core), `OCES.Resonance.AtlFieldExtractor` (extractor), `Core.Tests` (tests), `GUI` / `GUI.Views` / `GUI.ViewModels` (GUI app).
 
 ## AI 助手工具说明
 

src/GUI/Assets/Locale.Designer.cs

@@ -0,0 +1,48 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace GUI {
+    using System;
+    
+    
+    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Locale {
+        
+        private static System.Resources.ResourceManager resourceMan;
+        
+        private static System.Globalization.CultureInfo resourceCulture;
+        
+        [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Locale() {
+        }
+        
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.Equals(null, resourceMan)) {
+                    System.Resources.ResourceManager temp = new System.Resources.ResourceManager("GUI.Locale", typeof(Locale).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+    }
+}

src/GUI/Assets/Locale.resx

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<root>
+    <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+        <xsd:element name="root" msdata:IsDataSet="true">
+            
+        </xsd:element>
+    </xsd:schema>
+    <resheader name="resmimetype">
+        <value>text/microsoft-resx</value>
+    </resheader>
+    <resheader name="version">
+        <value>1.3</value>
+    </resheader>
+    <resheader name="reader">
+        <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    </resheader>
+    <resheader name="writer">
+        <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    </resheader>
+</root>

src/GUI/GUI.csproj

@@ -28,4 +28,19 @@
     <ItemGroup>
         <ProjectReference Include="..\Core\Core.csproj" />
     </ItemGroup>
+
+    <ItemGroup>
+      <EmbeddedResource Update="Assets\Locale.resx">
+        <Generator>ResXFileCodeGenerator</Generator>
+        <LastGenOutput>Locale.Designer.cs</LastGenOutput>
+      </EmbeddedResource>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Compile Update="Assets\Locale.Designer.cs">
+        <DesignTime>True</DesignTime>
+        <AutoGen>True</AutoGen>
+        <DependentUpon>Locale.resx</DependentUpon>
+      </Compile>
+    </ItemGroup>
 </Project>

src/Resonance.sln.DotSettings.user

@@ -23,4 +23,10 @@
     <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.IntegratedTest.ScanReadWritePipeline_ShouldGenerateDatabase</TestId>
     <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.IntegratedTest</TestId>
   </TestAncestor>
-&lt;/SessionState&gt;</s:String></wpf:ResourceDictionary>
+&lt;/SessionState&gt;</s:String>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/CheckedGroups/=GUI_002FAssets_002FLocale/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/CheckedGroups/=GUI_002FLocale/@EntryIndexedValue">False</s:Boolean>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/CheckedGroups/=GUI_002FLocale/@EntryIndexRemoved">True</s:Boolean>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/CheckedGroups/=GUI_002FResources1/@EntryIndexedValue">False</s:Boolean>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/CheckedGroups/=GUI_002FResources1/@EntryIndexRemoved">True</s:Boolean>
+	<s:Boolean x:Key="/Default/ResxEditorPersonal/Initialized/@EntryValue">True</s:Boolean></wpf:ResourceDictionary>