feat: migrate config beside executable

internal/ui/shell.go

@@ -476,6 +476,12 @@ func (s *Shell) SetSettings(value SettingsState) {
 	s.closeOnExit.Value = value.CloseOnExit
 }
 
+// ReportStartupIssue records a safe, user-recoverable configuration message.
+// The application calls it before the frame loop starts; it performs no I/O.
+func (s *Shell) ReportStartupIssue(message string) {
+	s.instanceFeedback = strings.TrimSpace(message)
+}
+
 func (s *Shell) OnSave(fn func(SettingsState)) { s.onSave = fn }
 
 func (s *Shell) OnInstancesChanged(fn func([]InstanceRow)) { s.onInstancesChanged = fn }

internal/ui/shell_test.go

@@ -26,6 +26,14 @@ func TestShellStartsWithSemanticInstanceStatuses(t *testing.T) {
 	}
 }
 
+func TestShellReportsSafeStartupIssue(t *testing.T) {
+	shell := NewShell(material.NewTheme())
+	shell.ReportStartupIssue(" 程序目录中的 config.json 无法使用；请检查目录权限或恢复旧配置。 ")
+	if shell.instanceFeedback != "程序目录中的 config.json 无法使用；请检查目录权限或恢复旧配置。" {
+		t.Fatalf("startup feedback = %q", shell.instanceFeedback)
+	}
+}
+
 func TestShellInstanceListScrollsVertically(t *testing.T) {
 	shell := NewShell(material.NewTheme())
 	if shell.list.Axis != layout.Vertical {