feat: frontend MVP — auth, timeline, upload, albums, admin, image viewer

Backend:
- user roles (DB + JWT + first-user-is-admin)
- volume-aware file resolver (multi-volume asset serving)
- directory scanner uses volume URI directly
- date-summary endpoint (capture date from EXIF)
- timeline ordered by capture date
- list endpoints: volumes, plugins, pipelines, library paths
- delete endpoints: volumes, library paths
- configurable upload body limit (MAX_UPLOAD_BYTES)

Frontend:
- auth: login/register, token refresh, role-based admin gate
- timeline: date-grouped grid, infinite scroll, date scrubber
- image viewer: fullscreen zoom/pan/pinch, metadata sidebar
- upload: drag-drop, sequential upload, progress tracking
- albums: create, add/remove photos, asset picker dialog
- admin: storage (import library), jobs (pagination, error details),
  plugins (list + toggle), pipelines, sidecars, duplicates
- multi-select mode with add-to-album action
- TanStack Query for all data fetching

crates/adapters/postgres/src/processing/mod.rs

@@ -405,6 +405,17 @@ impl PluginRepository for PostgresPluginRepository {
         Ok(row.map(Into::into))
     }
 
+    async fn find_all(&self) -> Result<Vec<Plugin>, DomainError> {
+        let rows = sqlx::query_as::<_, PluginRow>(
+            "SELECT plugin_id, name, plugin_type, is_enabled, configuration FROM plugins",
+        )
+        .fetch_all(&self.pool)
+        .await
+        .map_pg()?;
+
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
     async fn find_enabled(&self) -> Result<Vec<Plugin>, DomainError> {
         let rows = sqlx::query_as::<_, PluginRow>(
             "SELECT plugin_id, name, plugin_type, is_enabled, configuration
@@ -521,6 +532,17 @@ impl PipelineRepository for PostgresPipelineRepository {
         Ok(row.map(Into::into))
     }
 
+    async fn find_all(&self) -> Result<Vec<ProcessingPipeline>, DomainError> {
+        let rows = sqlx::query_as::<_, PipelineRow>(
+            "SELECT pipeline_id, trigger_event, steps FROM processing_pipelines",
+        )
+        .fetch_all(&self.pool)
+        .await
+        .map_pg()?;
+
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
     async fn find_by_trigger(&self, event: &str) -> Result<Vec<ProcessingPipeline>, DomainError> {
         let rows = sqlx::query_as::<_, PipelineRow>(
             "SELECT pipeline_id, trigger_event, steps