fix: add missing python-domain-events to root pyproject.toml and update count to 17

Package existed in packages/ and was published to TestPyPI but was not registered in root dependencies or import-linter config.

Author: FirstUnicorn

pyproject.toml

@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "python-web-toolkit"
 version = "0.1.0"
-description = "Comprehensive Python web development toolkit - monorepo with 16 micro-libraries"
+description = "Comprehensive Python web development toolkit - monorepo with 17 micro-libraries"
 authors = ["GridFlow Team <vialogue@proton.me>"]
 readme = "README.md"
 license = "MIT"
@@ -51,6 +51,7 @@ fastapi-middleware-toolkit = {path = "packages/fastapi-middleware-toolkit", deve
 python-structlog-config = {path = "packages/python-structlog-config", develop = true}
 
 # Event-Driven / Outbox Pattern
+python-domain-events = {path = "packages/python-domain-events", develop = true}
 python-outbox-core = {path = "packages/python-outbox-core", develop = true}
 
 [tool.poetry.group.dev.dependencies]
@@ -129,6 +130,7 @@ root_packages = [
     "python_mediator",
     "pydantic_response_models",
     "python_structlog_config",
+    "python_domain_events",
     "python_outbox_core",
     "sqlalchemy_async_session_factory",
     "python_dto_mappers",
@@ -163,6 +165,7 @@ type = "forbidden"
 source_modules = [
     "python_cqrs_core",
     "python_mediator",
+    "python_domain_events",
     "pydantic_response_models",
     "python_dto_mappers",
     "python_input_validation",