Docs: Update version references to v0.27.2 in READMEs and docs (#19501)

- Update version tags in README files (including translations) from
v0.27.1 to v0.27.2
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

uv.lock

@@ -8169,7 +8169,7 @@ wheels = [
 
 [[package]]
 name = "ragflow"
-version = "0.27.1"
+version = "0.27.2"
 source = { virtual = "." }
 dependencies = [
     { name = "agentrun-sdk" },