Refactor project structure and enhance backend integration

- Expanded package inclusion in `pyproject.toml` to support new modules.
- Introduced new `adapters` and `protocol` packages for better organization.
- Added backend adapter implementations for control plane integration.
- Updated main application imports to reflect new package structure.
- Removed deprecated core components and adjusted documentation accordingly.
- Enhanced architecture documentation to clarify the new runtime and integration layers.

engine/pyproject.toml

@@ -31,7 +31,17 @@ Issues = "https://github.com/yourusername/py-active-call-cc/issues"
 
 [tool.setuptools.packages.find]
 where = ["."]
-include = ["app*"]
+include = [
+    "app*",
+    "adapters*",
+    "protocol*",
+    "providers*",
+    "processors*",
+    "runtime*",
+    "tools*",
+    "utils*",
+    "workflow*",
+]
 exclude = ["tests*", "scripts*", "reference*"]
 
 [tool.black]