Revert "🐛 Preserve path segments when joining backend URIs (#12152)" (#12156)

This reverts commit 2a6e92a7d9a5520365276f7b9a6ae59d478159ee.

backend/src/app/config.clj

@@ -432,13 +432,6 @@
   (or (c/get config :file-clean-delay)
       (ct/duration {:days 2})))
 
-(defn- join-path-segments
-  [segments]
-  (let [path (->> segments (map str) (str/join "/"))]
-    (->> (str/split path #"/")
-         (remove str/blank?)
-         (str/join "/"))))
-
 (defn join-uri
   "Join path segments onto a base URI, preserving a potential subpath
   (same semantics as the frontend config). The base is normalized with
@@ -447,8 +440,7 @@
   [base & segments]
   (assert (not (some #(str/starts-with? % "/") segments))
           "URI segments must be relative (no leading slash)")
-  (str (u/join (u/ensure-path-slash base)
-               (join-path-segments segments))))
+  (str (apply u/join (u/ensure-path-slash base) segments)))
 
 (defn get-public-uri
   "Canonical public URI builder: `join-uri` over the configured

backend/test/backend_tests/config_test.clj

@@ -34,15 +34,6 @@
     (t/is (= "https://nitrate.example.com/api/teams/123"
              (cf/join-uri "https://nitrate.example.com/" "api/teams/123")))))
 
-(t/deftest join-uri-joins-multiple-segments
-  (t/testing "path segments are appended instead of replacing previous segments"
-    (t/is (= "https://nitrate.example.com/admin-console/api/teams/team-id/users/profile-id"
-             (cf/join-uri "https://nitrate.example.com/admin-console"
-                          "api/teams/"
-                          "team-id"
-                          "users/"
-                          "profile-id")))))
-
 (t/deftest join-uri-rejects-leading-slash
   (t/testing "a leading slash would drop the subpath, so it fails fast"
     (t/is (thrown? AssertionError