feat: frontend-ready backend — pagination, auto-derivatives, list endpoints, bulk ops, OpenAPI

Pagination: count_by_owner + count_search on AssetRepository,
timeline/search return real total count (not page len).

Auto-derivatives: worker enqueues GenerateDerivative when
ExtractMetadata job completes, closing the upload→thumbnail gap.

List endpoints: GET /albums, GET /stacks with user scoping.
ListAlbumsHandler, ListStacksHandler, find_by_owner on AssetStackRepository.

Tag filtering: tag_name field on AssetFilters, JOIN asset_tags+tags
in postgres search/count queries.

Bulk operations: POST /assets/bulk-delete, POST /assets/bulk-tag.

Album update: PUT /albums/{id} with UpdateAlbumHandler (title, description).

OpenAPI: utoipa annotations on all 47 endpoints + all request/response
schemas registered. Scalar UI at /scalar covers full API.

crates/presentation/src/state.rs

@@ -4,15 +4,16 @@ use application::{
     catalog::{
         CreateStackHandler, DeleteAssetHandler, DeleteStackHandler, DetectLivePhotosHandler,
         GetAssetHandler, GetStackHandler, GetTimelineHandler, ListDuplicatesHandler,
-        ReadAssetFileHandler, ReadDerivativeHandler, RegisterAssetHandler, ResolveDuplicateHandler,
-        SearchAssetsHandler, UpdateMetadataHandler,
+        ListStacksHandler, ReadAssetFileHandler, ReadDerivativeHandler, RegisterAssetHandler,
+        ResolveDuplicateHandler, SearchAssetsHandler, UpdateMetadataHandler,
     },
     identity::{
         GetProfileHandler, LoginUserHandler, LogoutHandler, RefreshTokenHandler,
         RegisterUserHandler,
     },
     organization::{
-        CreateAlbumHandler, GetAlbumHandler, ManageAlbumEntriesHandler, TagAssetHandler,
+        CreateAlbumHandler, GetAlbumHandler, ListAlbumsHandler, ManageAlbumEntriesHandler,
+        TagAssetHandler, UpdateAlbumHandler,
     },
     processing::{
         CompleteJobHandler, ConfigurePipelineHandler, EnqueueJobHandler, FailJobHandler,
@@ -59,13 +60,16 @@ pub struct CatalogHandlers {
     pub get_stack: Arc<GetStackHandler>,
     pub delete_stack: Arc<DeleteStackHandler>,
     pub detect_live_photos: Arc<DetectLivePhotosHandler>,
+    pub list_stacks: Arc<ListStacksHandler>,
 }
 
 #[derive(Clone)]
 pub struct OrganizationHandlers {
     pub create_album: Arc<CreateAlbumHandler>,
     pub get_album: Arc<GetAlbumHandler>,
+    pub list_albums: Arc<ListAlbumsHandler>,
     pub manage_album_entries: Arc<ManageAlbumEntriesHandler>,
+    pub update_album: Arc<UpdateAlbumHandler>,
     pub tag_asset: Arc<TagAssetHandler>,
 }