Hard caps on creating projects/orgs/collections (#4430)

* implement backend limits on project creation

* implement collection, org creation hard caps

* Fix limit api

* Fix clippy

* Fix limits

* Update sqlx queries

* Address PR comments on user limit structure

* sqlx prepare and clippy

* fix test maybe

apps/labrinth/src/routes/v3/collections.rs

@@ -8,6 +8,7 @@ use crate::file_hosting::{FileHost, FileHostPublicity};
 use crate::models::collections::{Collection, CollectionStatus};
 use crate::models::ids::{CollectionId, ProjectId};
 use crate::models::pats::Scopes;
+use crate::models::v3::user_limits::UserLimits;
 use crate::queue::session::AuthQueue;
 use crate::routes::ApiError;
 use crate::routes::v3::project_creation::CreateError;
@@ -76,6 +77,12 @@ pub async fn collection_create(
     .await?
     .1;
 
+    let limits =
+        UserLimits::get_for_collections(&current_user, &client).await?;
+    if limits.current >= limits.max {
+        return Err(CreateError::LimitReached);
+    }
+
     collection_create_data.validate().map_err(|err| {
         CreateError::InvalidInput(validation_errors_to_string(err, None))
     })?;