fix(model-server): add repository to the list after the first write

The v1 model client doesn't initialize a repository using the REST API,
but just starts writing to a branch. This first write should add the
repository to the list returned by the REST API, which wasn't the case.

model-server/src/main/kotlin/org/modelix/model/server/handlers/RepositoriesManager.kt

@@ -165,6 +165,7 @@ class RepositoriesManager(val client: LocalModelClient) {
                 mergedVersion.hash
             }
             putVersionHash(branch, mergedHash)
+            ensureRepositoriesAreInList(setOf(branch.repositoryId))
             ensureBranchesAreInList(branch.repositoryId, setOf(branch.branchName))
             result = mergedHash
         }