fix: postCreate failures (absolute paths, sudo HOME, socket-wait bug)

.devcontainer/setup.sh

@@ -11,8 +11,10 @@ REPO=/srv/kirche-einfach
 # UV_PROJECT_ENVIRONMENT/UV_PYTHON_INSTALL_DIR plus every compose-provided
 # variable — uv then created a project-local backend/.venv in the bind-mount
 # instead of using /opt/venv, and sync_flows.py ran without its settings.)
+# -H repoints HOME to /home/vscode: without it HOME stays /root (from the
+# outer sudo) and uv/pip caches fail with Permission denied.
 as_vscode() {
-  sudo -u vscode -E bash -c "$*"
+  sudo -H -u vscode -E bash -c "$*"
 }
 
 # Venv lives outside the bind-mount (see backend/Dockerfile).
@@ -71,13 +73,13 @@ targets = [("langflow", 7860), ("lfx", 6004)]
 deadline = time.time() + 180
 pending = dict(targets)
 while pending and time.time() < deadline:
-    for host, port in list(pending):
+    for host, port in list(pending.items()):
         s = socket.socket()
         s.settimeout(2)
         try:
             s.connect((host, port))
             print(f"OK {host}:{port}", flush=True)
-            del pending[(host, port)]
+            del pending[host]
         except OSError:
             pass
         finally: