🐛 Add concurrency limit to import-binfile RPC handler

Apply climit with 4 global permits and 1 per-profile permit (queue 2)
to prevent connection pool exhaustion from concurrent imports. Each
import holds a DB connection for its entire duration with idle
transaction timeout disabled, so unbounded concurrency could exhaust
the pool (default 60 connections).

AI-assisted-by: mimo-v2.5-pro

backend/resources/climit.edn

@@ -39,4 +39,10 @@
  {:permits 3}
 
  :create-file-snapshot/by-profile
- {:permits 1 :queue 2 :timeout 60000}}
+ {:permits 1 :queue 2 :timeout 60000}
+
+ :import-binfile/global
+ {:permits 4}
+
+ :import-binfile/by-profile
+ {:permits 1 :queue 2}}

backend/src/app/rpc/commands/binfile.clj

@@ -21,6 +21,7 @@
    [app.loggers.webhooks :as-alias webhooks]
    [app.media :as media]
    [app.rpc :as-alias rpc]
+   [app.rpc.climit :as-alias climit]
    [app.rpc.commands.files :as files]
    [app.rpc.commands.media :as media-cmd]
    [app.rpc.commands.projects :as projects]
@@ -148,7 +149,9 @@
 
    ::webhooks/event? true
    ::sse/stream? true
-   ::sm/params schema:import-binfile}
+   ::sm/params schema:import-binfile
+   ::climit/id [[:import-binfile/by-profile ::rpc/profile-id]
+                [:import-binfile/global]]}
   [{:keys [::db/pool] :as cfg} {:keys [::rpc/profile-id project-id version file-id upload-id] :as params}]
   (projects/check-edition-permissions! pool profile-id project-id)
   (let [version (or version 3)