fix: prevent pyzmq compilation during tests

- Cap pyzmq version to <27 for manylinux2014 compatibility
- Pre-install pyzmq binary wheel before tests using CIBW_BEFORE_TEST
- Force pip to use only binary wheels with --only-binary :all:

packages/leann-backend-hnsw/pyproject.toml

@@ -11,7 +11,7 @@ description = "Custom-built HNSW (Faiss) backend for the Leann toolkit."
 dependencies = [
     "leann-core==0.1.8", 
     "numpy",
-    "pyzmq>=23.0.0",
+    "pyzmq>=23.0.0,<27",  # Cap at 26.x for manylinux2014 compatibility
     "msgpack>=1.0.0",
 ]
 

packages/leann-core/pyproject.toml

@@ -15,7 +15,7 @@ dependencies = [
     "numpy>=1.20.0",
     "tqdm>=4.60.0",
     "psutil>=5.8.0",
-    "pyzmq>=23.0.0",
+    "pyzmq>=23.0.0,<27",  # Cap at 26.x for manylinux2014 compatibility
     "msgpack>=1.0.0",
     "torch>=2.0.0",
     "sentence-transformers>=2.2.0",