chore: add project scaffolding and resources

This initial commit scaffolds the project with essential docs, assets, and build configs.
It adds Android icons, design assets, and release metadata to support mobile targets.
A fastlane config and F-Droid manifest are included to streamline builds.

- Adds F-Droid configuration for automated builds
- Includes license and privacy policy documents
- Provides app icons and assets for Android and design system

plugins/src/models.rs

@@ -5,6 +5,7 @@ use serde::{Deserialize, Serialize};
 pub struct WallpaperState {
     pub image_count: usize,
     pub enabled: bool,
+    pub interval_minutes: usize,
     pub shuffle: bool,
     pub lock_screen_only: bool,
     pub current_index: usize,
@@ -18,6 +19,12 @@ pub struct SettingRequest {
     pub value: bool,
 }
 
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct IntervalRequest {
+    pub minutes: usize,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct GalleryRequest {
@@ -31,6 +38,18 @@ pub struct DeleteImageRequest {
     pub id: String,
 }
 
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DeleteImagesRequest {
+    pub ids: Vec<String>,
+}
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ImageIdsResponse {
+    pub ids: Vec<String>,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct ImageCropRequest {