🐛 Include tenant in library summary cache keys

The redis cache keys for the file library summary were built as
penpot.library-summary.<file-id>, missing the tenant component used
by the rest of the shared-infrastructure keys (rlimit, msgbus,
worker queues).

Build the key with a new file-summary-cache-key function that appends
the configured tenant, following the penpot.library-summary.<tenant>.<file-id>
pattern. Stale keys in the old format expire on their own with the
existing 30-day TTL.

Closes #11407

AI-assisted-by: glm-5.3-flash

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

@@ -515,8 +515,11 @@
 (def ^:private file-summary-cache-key-ttl
   (ct/duration {:days 30}))
 
-(def file-summary-cache-key-prefix
-  "penpot.library-summary.")
+(defn file-summary-cache-key
+  "Build the redis cache key for the file library summary. The tenant is
+   included to prevent key collisions between tenants sharing a redis instance"
+  [id]
+  (str "penpot.library-summary." (cf/get :tenant) "." id))
 
 (defn- get-file-with-summary
   "Get a file without data with a summary of its local library content"
@@ -545,7 +548,7 @@
                    (rds/build-set-args {:ex file-summary-cache-key-ttl})))]
 
     (if (contains? cf/flags :redis-cache)
-      (let [cache-key (str file-summary-cache-key-prefix id)]
+      (let [cache-key (file-summary-cache-key id)]
         (or (rds/run! cfg get-from-cache cache-key)
             (let [file (calculate-from-db)]
               (rds/run! cfg persist-to-cache (:library-summary file) cache-key)

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

@@ -322,7 +322,7 @@
 (defn- invalidate-caches!
   [cfg {:keys [id] :as file}]
   (rds/run! cfg (fn [{:keys [::rds/conn]}]
-                  (let [key (str files/file-summary-cache-key-prefix id)]
+                  (let [key (files/file-summary-cache-key id)]
                     (rds/del conn key)))))
 
 (defn- attach-snapshot