feat: DEFAULT_LANGUAGE/DEFAULT_TIMEZONE config + public GET /api/config

crates/api/src/config.rs

@@ -0,0 +1,29 @@
+use axum::{Json, Router, extract::State, routing::get};
+use serde::Serialize;
+use utoipa::ToSchema;
+
+use crate::AppState;
+
+/// Public, non-sensitive instance configuration the SPA needs before login.
+#[derive(Serialize, ToSchema)]
+pub(crate) struct ConfigView {
+    /// User-facing product name.
+    pub app_name: String,
+    /// Default UI/content language (i18n key, e.g. "sv").
+    pub default_language: String,
+    /// Default display timezone (IANA name). Storage is UTC; this is a display hint.
+    pub default_timezone: String,
+}
+
+#[utoipa::path(get, path = "/api/config", responses((status = 200, body = ConfigView)))]
+pub(crate) async fn get_config(State(state): State<AppState>) -> Json<ConfigView> {
+    Json(ConfigView {
+        app_name: state.app_name.clone(),
+        default_language: state.default_language.clone(),
+        default_timezone: state.default_timezone.clone(),
+    })
+}
+
+pub(crate) fn routes() -> Router<AppState> {
+    Router::new().route("/api/config", get(get_config))
+}

crates/api/src/lib.rs

@@ -5,6 +5,7 @@ mod admin_authorities;
 mod admin_objects;
 mod admin_search;
 mod admin_vocab;
+mod config;
 mod health;
 mod openapi;
 mod pagination;
@@ -30,6 +31,10 @@ pub struct AppState {
     /// Search client for on-write index sync. `None` disables indexing (search is a
     /// best-effort feature; absent when Meilisearch is not configured).
     pub search: Option<search::SearchClient>,
+    /// Instance default UI/content language (from config).
+    pub default_language: String,
+    /// Instance default display timezone, IANA name (from config). Storage stays UTC.
+    pub default_timezone: String,
 }
 
 /// Best-effort: keep the search index in step with a catalogue write that has already
@@ -58,6 +63,7 @@ pub fn build_app(state: AppState) -> Router {
         .with_expiry(Expiry::OnInactivity(Duration::hours(8)));
 
     Router::new()
+        .merge(config::routes())
         .merge(health::routes())
         .merge(openapi::routes())
         .merge(public::routes())

crates/api/src/openapi.rs

@@ -2,12 +2,14 @@ use axum::{Json, Router, extract::State, routing::get};
 use utoipa::OpenApi;
 
 use crate::{
-    AppState, admin, admin_authorities, admin_objects, admin_search, admin_vocab, health, public,
+    AppState, admin, admin_authorities, admin_objects, admin_search, admin_vocab, config, health,
+    public,
 };
 
 #[derive(OpenApi)]
 #[openapi(
     paths(
+        config::get_config,
         health::live,
         health::ready,
         public::list_objects,
@@ -34,6 +36,7 @@ use crate::{
         admin_authorities::create_authority
     ),
     components(schemas(
+        config::ConfigView,
         health::Live,
         health::Ready,
         public::PublicView,