refactor(core): decouple actors and remove workflow templates (#67)

Removes the deprecated `workflow_template` concept entirely across both backend API routers, internal logic handling within the `supervisory_node` and `consciousness_node`, and front-end components. Enables `consciousness_node` to work autonomously.

Also refactors core package structure to enforce the "one python package, one Ray Actor" architectural rule. `GlobalWorkflowManager`, `WorkflowRunningEngine`, `PostgresDatabase`, and `WorkerCluster` have been moved to their own top-level decoupled package directories with properly exported `__init__.py` modules. Test suites have been relocated and import paths updated across the system.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: zhaoxi826 <198742034+zhaoxi826@users.noreply.github.com>

tests/core/database/database_exception_test.py

@@ -5,34 +5,42 @@ from pydantic import ValidationError
 from pretor.utils.error import UserNotExistError
 from pretor.core.database.database_exception import database_exception
 
+
 @database_exception
 async def success_func():
     return "success"
 
+
 @database_exception
 async def validation_error_func():
     raise ValidationError.from_exception_data(title="Mock", line_errors=[])
 
+
 @database_exception
 async def integrity_error_func():
     raise IntegrityError("mock_statement", "mock_params", "mock_orig")
 
+
 @database_exception
 async def operational_error_func():
     raise OperationalError("mock_statement", "mock_params", "mock_orig")
 
+
 @database_exception
 async def user_not_exist_error_func():
     raise UserNotExistError("mock user")
 
+
 @database_exception
 async def exception_func():
     raise Exception("mock generic exception")
 
+
 @pytest.mark.asyncio
 async def test_success_func():
     assert await success_func() == "success"
 
+
 @pytest.mark.asyncio
 @patch("pretor.core.database.database_exception.logger")
 async def test_validation_error(mock_logger):
@@ -41,6 +49,7 @@ async def test_validation_error(mock_logger):
     mock_logger.error.assert_called_once()
     assert "对象校验失败" in mock_logger.error.call_args[0][0]
 
+
 @pytest.mark.asyncio
 @patch("pretor.core.database.database_exception.logger")
 async def test_integrity_error(mock_logger):
@@ -49,6 +58,7 @@ async def test_integrity_error(mock_logger):
     mock_logger.error.assert_called_once()
     assert "数据库完整性错误" in mock_logger.error.call_args[0][0]
 
+
 @pytest.mark.asyncio
 @patch("pretor.core.database.database_exception.logger")
 async def test_operational_error(mock_logger):
@@ -57,6 +67,7 @@ async def test_operational_error(mock_logger):
     mock_logger.error.assert_called_once()
     assert "数据库连接异常" in mock_logger.error.call_args[0][0]
 
+
 @pytest.mark.asyncio
 @patch("pretor.core.database.database_exception.logger")
 async def test_user_not_exist_error(mock_logger):
@@ -65,6 +76,7 @@ async def test_user_not_exist_error(mock_logger):
     mock_logger.error.assert_called_once()
     assert "更改密码失败，用户不存在" in mock_logger.error.call_args[0][0]
 
+
 @pytest.mark.asyncio
 @patch("pretor.core.database.database_exception.logger")
 async def test_generic_exception(mock_logger):