fix: rename OPDS test libraries to include "test" for cleanup

Changes the library names in TestOPDSSearchAcrossLibraries from:
- "OPDS Lib 1" → "OPDS Test Lib 1"
- "OPDS Lib 2" → "OPDS Test Lib 2"

This ensures these libraries are properly cleaned up by the test cleanup
logic that deletes libraries with "test" in their name.

Combined with the cleanup fix in the previous commit, this ensures that
all OPDS test libraries are removed after tests complete, preventing
residual data in the database.

Files changed:
- cmd/server/tests/opds_test.go: Renamed libraries to include "test"

cmd/server/tests/opds_test.go

@@ -344,8 +344,8 @@ func TestOPDSSearchAcrossLibraries(t *testing.T) {
 	client := &http.Client{}
 
 	// Create two libraries
-	lib1Resp := createLibrary(t, client, setup, "OPDS Lib 1")
-	lib2Resp := createLibrary(t, client, setup, "OPDS Lib 2")
+	lib1Resp := createLibrary(t, client, setup, "OPDS Test Lib 1")
+	lib2Resp := createLibrary(t, client, setup, "OPDS Test Lib 2")
 
 	// Add folders
 	addFolderToLibrary(t, setup, lib1Resp["id"].(string), "/app/uploads")