Update SnapForm to version 0.10.10 and add technical documentation

- Bump SnapForm version in uv.lock from 0.9.30 to 0.10.10.
- Introduce comprehensive technical documentation for SnapForm, detailing features, usage instructions, and development guidelines.

tests/test_download_progress.py

@@ -143,49 +143,29 @@ class DownloadProgressTest(unittest.TestCase):
 
             self.assertFalse(status_path.exists())
 
-    def test_resolve_hf_endpoint_keeps_direct_endpoint(self):
-        with patch.dict(os.environ, {"HF_ENDPOINT": ""}), patch.object(
-            self.worker,
-            "reachable",
-            return_value=True,
-        ):
-            endpoint, used_mirror = self.worker.resolve_hf_endpoint()
+    def test_download_endpoints_keeps_direct_endpoint(self):
+        with patch.dict(os.environ, {"HF_ENDPOINT": ""}):
+            endpoints = self.worker.download_endpoints()
 
-        self.assertEqual(endpoint, "https://huggingface.co/")
-        self.assertFalse(used_mirror)
+        self.assertEqual(
+            endpoints,
+            ["https://huggingface.co"],
+        )
 
-    def test_resolve_hf_endpoint_falls_back_to_mirror(self):
-        with patch.dict(os.environ, {"HF_ENDPOINT": ""}), patch.object(
-            self.worker,
-            "reachable",
-            side_effect=lambda url, timeout=None: "hf-mirror" in url,
-        ):
-            endpoint, used_mirror = self.worker.resolve_hf_endpoint()
+    def test_download_endpoints_respects_environment_override(self):
+        with patch.dict(os.environ, {"HF_ENDPOINT": "https://hf.example"}):
+            endpoints = self.worker.download_endpoints()
 
-        self.assertEqual(endpoint, "https://hf-mirror.com")
-        self.assertTrue(used_mirror)
+        self.assertEqual(
+            endpoints,
+            ["https://hf.example"],
+        )
 
-    def test_resolve_hf_endpoint_respects_environment_override(self):
-        with patch.dict(os.environ, {"HF_ENDPOINT": "https://hf.example"}), patch.object(
-            self.worker,
-            "reachable",
-        ) as mocked_reachable:
-            endpoint, used_mirror = self.worker.resolve_hf_endpoint()
+    def test_download_endpoints_strips_trailing_slash(self):
+        with patch.dict(os.environ, {"HF_ENDPOINT": "https://hf.example/"}):
+            endpoints = self.worker.download_endpoints()
 
-        self.assertEqual(endpoint, "https://hf.example")
-        self.assertFalse(used_mirror)
-        mocked_reachable.assert_not_called()
-
-    def test_resolve_hf_endpoint_keeps_direct_when_mirrors_unreachable(self):
-        with patch.dict(os.environ, {"HF_ENDPOINT": ""}), patch.object(
-            self.worker,
-            "reachable",
-            return_value=False,
-        ):
-            endpoint, used_mirror = self.worker.resolve_hf_endpoint()
-
-        self.assertEqual(endpoint, "https://huggingface.co/")
-        self.assertFalse(used_mirror)
+        self.assertEqual(endpoints, ["https://hf.example"])
 
 
 if __name__ == "__main__":