feat(pferde-feature): introduce Pferde management module with screens, ViewModel, and domain models

- Added `pferde-feature` module for managing horses, including list, detail, and editing views.
- Implemented `MsMasterDetailLayout` for PferdeScreen, integrating `MsDataTable`, `MsFilterBar`, and `MsActionToolbar`.
- Defined domain models (`Pferd`, `Geschlecht`, `PferdeStatus`) with mock data support.
- Updated roadmap to mark `Pferde-Verwaltung (MVP)` as complete.
- Registered the new module in `settings.gradle.kts` and `meldestelle-desktop` build configuration.
- Added previews for Pferde and Reiter components to support IDE render.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/features/pferde-feature/build.gradle.kts

@@ -0,0 +1,32 @@
+/**
+ * Feature-Modul: Pferde-Verwaltung (Desktop-only)
+ */
+plugins {
+  alias(libs.plugins.kotlinMultiplatform)
+  alias(libs.plugins.composeMultiplatform)
+  alias(libs.plugins.composeCompiler)
+}
+
+group = "at.mocode.clients"
+version = "1.0.0"
+
+kotlin {
+  jvm()
+  sourceSets {
+    jvmMain.dependencies {
+      implementation(projects.frontend.core.designSystem)
+      implementation(projects.frontend.core.domain)
+      implementation(projects.frontend.core.navigation)
+      implementation(compose.desktop.currentOs)
+      implementation(compose.foundation)
+      implementation(compose.runtime)
+      implementation(compose.material3)
+      implementation(compose.ui)
+      implementation(compose.materialIconsExtended)
+      implementation(libs.bundles.kmp.common)
+      implementation(libs.koin.core)
+      implementation(libs.koin.compose)
+      implementation(libs.koin.compose.viewmodel)
+    }
+  }
+}