feat: safe deletion, album/asset delete, trash, README update

- volume-aware deletion: read-only volumes remove DB only, writable
  volumes soft-delete to trash with configurable grace period
- trash page with restore, worker purge sweep (TRASH_RETENTION_DAYS)
- album delete endpoint + sidebar trash icon
- asset delete from timeline selection toolbar
- all listing queries exclude trashed assets (deleted_at IS NULL)
- timeline ordered by EXIF capture date, date-summary endpoint
- README rewritten with features, setup, full env var table

crates/application/src/catalog/queries/list_trash.rs

@@ -0,0 +1,34 @@
+use domain::{
+    entities::Asset, errors::DomainError, ports::AssetRepository, value_objects::SystemId,
+};
+use std::sync::Arc;
+
+pub struct ListTrashQuery {
+    pub owner_id: SystemId,
+    pub limit: u32,
+    pub offset: u32,
+}
+
+pub struct TrashResult {
+    pub assets: Vec<Asset>,
+    pub total: u64,
+}
+
+pub struct ListTrashHandler {
+    asset_repo: Arc<dyn AssetRepository>,
+}
+
+impl ListTrashHandler {
+    pub fn new(asset_repo: Arc<dyn AssetRepository>) -> Self {
+        Self { asset_repo }
+    }
+
+    pub async fn execute(&self, query: ListTrashQuery) -> Result<TrashResult, DomainError> {
+        let total = self.asset_repo.count_trashed(&query.owner_id).await?;
+        let assets = self
+            .asset_repo
+            .find_trashed_by_owner(&query.owner_id, query.limit, query.offset)
+            .await?;
+        Ok(TrashResult { assets, total })
+    }
+}

crates/application/src/catalog/queries/mod.rs

@@ -1,5 +1,6 @@
 pub mod get_asset;
 pub mod get_date_summary;
+pub mod list_trash;
 pub mod get_stack;
 pub mod get_timeline;
 pub mod list_stacks;