feat(admin): add global message query route

crates/delta/src/routes/admin/stats.rs

@@ -0,0 +1,13 @@
+use revolt_quark::models::stats::Stats;
+use revolt_quark::{Db, Result};
+
+use rocket::serde::json::Json;
+
+/// # Query Stats
+///
+/// Fetch various technical statistics.
+#[openapi(tag = "Admin")]
+#[get("/stats")]
+pub async fn stats(db: &Db) -> Result<Json<Stats>> {
+    Ok(Json(db.generate_stats().await?))
+}