Major refactor

crates/siren-api/src/app_state.rs

@@ -0,0 +1,23 @@
+use dashmap::DashMap;
+use serenity::{
+  all::{Cache, Http},
+  prelude::Mutex,
+};
+use std::{collections::HashMap, sync::Arc};
+use tokio::sync::broadcast;
+
+#[derive(Clone)]
+pub struct AppState {
+  pub client: reqwest::Client,
+  pub client_id: String,
+  pub client_secret: String,
+  pub base_url: String,
+  /// Maps oauth_state → ui_redirect_uri.
+  /// Populated on /authorize, consumed on /callback.
+  pub discord_authorize_cache: Arc<Mutex<HashMap<String, String>>>,
+  pub http: Arc<Http>,
+  pub cache: Arc<Cache>,
+  /// Per-map WebSocket broadcast channels for real-time collaboration.
+  /// Key is the CSPRNG map ID (TEXT).
+  pub map_rooms: Arc<DashMap<String, broadcast::Sender<String>>>,
+}