chore: normalize line endings (CRLF -> LF)

No content changes: git diff --ignore-all-space over these files is empty.
The churn came from editing on Windows against a repo checked out with LF.

backend/docker-compose.override.yml

@@ -1,9 +1,9 @@
-services:
-  db:
-    ports:
-      - "5432:5432"
-  pipeline-api:
-    ports:
-      - "8090:8090"
-    environment:
-      - VLLM_SERVER_URL=http://paddleocr-vllm-server:8118/v1
+services:
+  db:
+    ports:
+      - "5432:5432"
+  pipeline-api:
+    ports:
+      - "8090:8090"
+    environment:
+      - VLLM_SERVER_URL=http://paddleocr-vllm-server:8118/v1