[+] fix singleton for summarizer

1. use explicit singleton class variable
    for Summarizer, instead of relying
    on fastapi Depends caching;

deps/test-task-2025-07-17-v2/docker/web/Dockerfile

@@ -45,7 +45,7 @@ RUN \
 	--break-system-packages \
 	--no-index \
 	-f releases/whl \
-	'online.fxreader.pr34.test_task_2025_07_17_v2==0.1.10'
+	'online.fxreader.pr34.test_task_2025_07_17_v2==0.1.11'
 
 ENTRYPOINT ["tini", "--"]
 CMD [ \

deps/test-task-2025-07-17-v2/pyproject.toml

@@ -9,7 +9,7 @@ classifiers = [
 ]
 
 name = 'online.fxreader.pr34.test_task_2025_07_17_v2'
-version = '0.1.10'
+version = '0.1.11'
 
 dependencies = [
 	'alembic',

deps/test-task-2025-07-17-v2/python/online/fxreader/pr34/test_task_2025_07_17_v2/transform/app.py

@@ -12,9 +12,9 @@ from typing import (Annotated,)
 def get_app_router() -> fastapi.APIRouter:
 	logger.info(dict(msg='started'))
 	router = fastapi.APIRouter(
-		dependencies=[
-			fastapi.Depends(summarizer_dependency,)
-		]
+		# dependencies=[
+		# 	fastapi.Depends(summarizer_dependency,)
+		# ]
 	)
 
 	router.include_router(

deps/test-task-2025-07-17-v2/python/online/fxreader/pr34/test_task_2025_07_17_v2/transform/dependencies.py

@@ -9,7 +9,8 @@ from typing import (Annotated,)
 
 async def create_summarizer(
 ) -> Summarizer:
-	return Summarizer()
+	# return Summarizer()
+	return Summarizer.singleton()
 
 AnnotatedSummarizer = 	Annotated[
 		Summarizer, fastapi.Depends(create_summarizer)

deps/test-task-2025-07-17-v2/python/online/fxreader/pr34/test_task_2025_07_17_v2/transform/worker.py

@@ -6,7 +6,7 @@ logger = logging.getLogger(__name__)
 
 from typing import (
 	Any, cast, Callable, Protocol, Literal, TypedDict,
-	TypeAlias,
+	TypeAlias, ClassVar, Optional,
 )
 
 class SummarizerPipeline(Protocol):
@@ -69,3 +69,12 @@ class Summarizer:
 		assert len(res) == 1
 
 		return res[0]['summary_text'].split()
+
+	_singleton: ClassVar[Optional['Summarizer']] = None
+
+	@classmethod
+	def singleton(cls) -> 'Summarizer':
+		if cls._singleton is None:
+			cls._singleton = Summarizer()
+
+		return cls._singleton