build: add README, pyproject.toml, package skeletons and smoke test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/unit/test_smoke.py

@@ -0,0 +1,19 @@
+"""冒烟测试：验证包可导入。"""
+
+
+def test_core_importable():
+    """core 包可导入。"""
+    import core
+    assert core is not None
+
+
+def test_app_importable():
+    """app 包可导入。"""
+    import app
+    assert app is not None
+
+
+def test_adapters_importable():
+    """adapters 包可导入。"""
+    import adapters
+    assert adapters is not None