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

crates/server/src/config.rs

@@ -50,4 +50,21 @@ pub struct Config {
         default_value_t = 5
     )]
     pub db_max_connections: u32,
+
+    /// Default UI + content-authoring language for this instance (i18n key, e.g. "sv").
+    #[arg(
+        long = "default-language",
+        env = "DEFAULT_LANGUAGE",
+        default_value = "sv"
+    )]
+    pub default_language: String,
+
+    /// Default display timezone (IANA name, e.g. "Europe/Stockholm"). Storage stays UTC;
+    /// this is a display hint surfaced to clients (and, later, server-side renderers).
+    #[arg(
+        long = "default-timezone",
+        env = "DEFAULT_TIMEZONE",
+        default_value = "Europe/Stockholm"
+    )]
+    pub default_timezone: String,
 }

crates/server/src/lib.rs

@@ -53,6 +53,8 @@ pub async fn run(config: Config) -> anyhow::Result<()> {
         app_name: config.app_name,
         cookie_secure: config.cookie_secure,
         search,
+        default_language: config.default_language,
+        default_timezone: config.default_timezone,
     };
 
     let listener = TcpListener::bind(&config.bind_addr)