refactor(settings): R.1 migrate config to user directory, deprecate .dsproj defaults

- Remove ProjectSettingsBackend, DsLabeler now uses AppSettingsBackend
- Move AppSettingsBackend from label-suite/ to shared/settings/
- Move SlicerConfig from defaults.slicer to slicer.params
- Move ExportConfig from defaults.export to top-level export
- Stop writing defaults section to .dsproj (backward-compatible read)
- Bump .dsproj version to 3.1.0
- Update tests for new API (exportConfig(), slicerState().params)

Author: wolfgitpr

docs/refactoring-roadmap-v2.md

@@ -69,10 +69,13 @@
 
 ### R.1 配置迁移到用户目录
 
-- [ ] 废弃 `ProjectSettingsBackend`
-- [ ] `ISettingsBackend` 仅保留 `AppSettingsBackend`
-- [ ] DsLabeler Settings 页切换到 `AppSettingsBackend`
-- [ ] `.dsproj` `defaults` 字段废弃（读取时忽略，不再写入）
+- [x] 废弃 `ProjectSettingsBackend`
+- [x] `ISettingsBackend` 仅保留 `AppSettingsBackend`
+- [x] DsLabeler Settings 页切换到 `AppSettingsBackend`
+- [x] `.dsproj` `defaults` 字段废弃（读取时迁移，不再写入）
+- [x] `SlicerConfig` 从 `defaults.slicer` 迁移到 `slicer.params`
+- [x] `ExportConfig` 从 `defaults.export` 迁移到顶层 `export`
+- [x] 版本号升级到 3.1.0
 - [ ] `ds-format.md` 更新
 
 ### R.2 模型懒加载

src/apps/ds-labeler/DsSlicerPage.cpp

@@ -644,12 +644,12 @@ namespace dstools {
         auto *project = m_dataSource->project();
 
         // Load slicer params from project defaults
-        const auto &slicerConfig = project->defaults().slicerConfig;
-        m_thresholdSpin->setValue(slicerConfig.threshold);
-        m_minLengthSpin->setValue(slicerConfig.minLength);
-        m_minIntervalSpin->setValue(slicerConfig.minInterval);
-        m_hopSizeSpin->setValue(slicerConfig.hopSize);
-        m_maxSilenceSpin->setValue(slicerConfig.maxSilence);
+        const auto &slicerParams = project->slicerState().params;
+        m_thresholdSpin->setValue(slicerParams.threshold);
+        m_minLengthSpin->setValue(slicerParams.minLength);
+        m_minIntervalSpin->setValue(slicerParams.minInterval);
+        m_hopSizeSpin->setValue(slicerParams.hopSize);
+        m_maxSilenceSpin->setValue(slicerParams.maxSilence);
 
         // Load slicer state (audio files + slice points) from project
         const auto &slicerState = project->slicerState();
@@ -1086,16 +1086,17 @@ namespace dstools {
         if (!m_dataSource || !m_dataSource->project())
             return;
 
-        auto defaults = m_dataSource->project()->defaults();
-        defaults.slicerConfig.threshold = m_thresholdSpin->value();
-        defaults.slicerConfig.minLength = m_minLengthSpin->value();
-        defaults.slicerConfig.minInterval = m_minIntervalSpin->value();
-        defaults.slicerConfig.hopSize = m_hopSizeSpin->value();
-        defaults.slicerConfig.maxSilence = m_maxSilenceSpin->value();
-        m_dataSource->project()->setDefaults(defaults);
+        auto *project = m_dataSource->project();
+        auto state = project->slicerState();
+        state.params.threshold = m_thresholdSpin->value();
+        state.params.minLength = m_minLengthSpin->value();
+        state.params.minInterval = m_minIntervalSpin->value();
+        state.params.hopSize = m_hopSizeSpin->value();
+        state.params.maxSilence = m_maxSilenceSpin->value();
+        project->setSlicerState(std::move(state));
 
         QString saveError;
-        m_dataSource->project()->save(saveError);
+        project->save(saveError);
     }
 
     void DsSlicerPage::saveSlicerStateToProject() {

src/apps/ds-labeler/ProjectSettingsBackend.cpp

@@ -14,7 +14,7 @@
 #include "DsSlicerPage.h"
 #include "ExportPage.h"
 #include "ProjectDataSource.h"
-#include "ProjectSettingsBackend.h"
+#include <AppSettingsBackend.h>
 #include "WelcomePage.h"
 
 #include <MinLabelPage.h>
@@ -61,7 +61,7 @@ int main(int argc, char *argv[]) {
 
     // Shared data source (lifetime = app)
     auto *dataSource = new dstools::ProjectDataSource(&shell);
-    auto *settingsBackend = new dstools::ProjectSettingsBackend(&shell);
+    auto *settingsBackend = new dstools::AppSettingsBackend(&shell);
     std::unique_ptr<dstools::DsProject> project;
 
     // ── Register all 7 pages ─────────────────────────────────────────────
@@ -109,7 +109,6 @@ int main(int argc, char *argv[]) {
                                     : project->workingDirectory();
 
         dataSource->setProject(project.get(), workDir);
-        settingsBackend->setProject(project.get());
 
         shell.setWindowTitle(
             QStringLiteral("DsLabeler — %1").arg(QFileInfo(path).fileName()));

src/apps/ds-labeler/ProjectSettingsBackend.h

@@ -8,8 +8,6 @@ dstools_add_executable(${PROJECT_NAME}
     DEPLOY WIN32_EXECUTABLE MACOSX_BUNDLE WINRC
     SOURCES
         main.cpp
-        AppSettingsBackend.h
-        AppSettingsBackend.cpp
         TaskWindowAdapter.h
         TaskWindowAdapter.cpp
         CleanupDialog.h

src/apps/ds-labeler/main.cpp

@@ -16,7 +16,7 @@
 
 #include "CleanupDialog.h"
 
-#include "AppSettingsBackend.h"
+#include <AppSettingsBackend.h>
 
 // Page includes
 #include <SlicerPage.h>

src/apps/label-suite/CMakeLists.txt

@@ -42,7 +42,7 @@ struct ExportConfig {
     bool includeDiscarded = false;
 };
 
-/// @brief Slicer parameter configuration stored in .dsproj defaults.slicer.
+/// @brief Slicer parameter configuration stored in .dsproj slicer.params.
 struct SlicerConfig {
     double threshold = -40.0;   ///< dB threshold for silence detection.
     int minLength = 5000;       ///< Minimum slice length in ms.
@@ -53,18 +53,20 @@ struct SlicerConfig {
 
 /// @brief Slicer runtime state stored in .dsproj slicer section.
 struct SlicerState {
+    SlicerConfig params;                                ///< Slicer parameters.
     QStringList audioFiles;                              ///< Audio file paths (POSIX).
     std::map<QString, std::vector<double>> slicePoints;  ///< filePath → boundary times (seconds).
 };
 
-/// Default model paths and inference parameters stored in a .dsproj file.
+/// Default model paths and inference parameters.
+/// @deprecated The `defaults` section is no longer written to .dsproj.
+/// Model/device config is stored in AppSettings (user directory).
+/// This struct is kept for backward-compatible migration on load only.
 struct DsProjectDefaults {
-    QString globalProvider = QStringLiteral("cpu");  ///< Global inference provider.
-    int deviceIndex = 0;                              ///< Global GPU device index.
-    std::map<QString, TaskModelConfig> taskModels;    ///< Task name → model config.
-    std::map<QString, PreloadConfig> preload;          ///< Task name → preload config.
-    ExportConfig exportConfig;
-    SlicerConfig slicerConfig;
+    QString globalProvider = QStringLiteral("cpu");
+    int deviceIndex = 0;
+    std::map<QString, TaskModelConfig> taskModels;
+    std::map<QString, PreloadConfig> preload;
 };
 
 /// @brief A single slice within an item.
@@ -124,6 +126,11 @@ class DsProject {
     const SlicerState &slicerState() const;
     void setSlicerState(SlicerState state);
 
+    // ── Export config ──────────────────────────────────────────────────
+
+    const ExportConfig &exportConfig() const;
+    void setExportConfig(ExportConfig config);
+
     // ── Path utilities ────────────────────────────────────────────────
 
     static QString toPosixPath(const QString &nativePath);
@@ -135,6 +142,7 @@ class DsProject {
     DsProjectDefaults m_defaults;
     std::vector<Item> m_items;
     SlicerState m_slicerState;
+    ExportConfig m_exportConfig;
     nlohmann::json m_extraFields;  // preserve unknown fields for round-trip
 };