Add OLake to README and Admin UI; fix catalog_olake path-style docs (#11858)

* README: mention OLake in the Iceberg lakehouse section

* catalog_olake: fix path-style prose; admin UI: list OLake as a REST catalog client

* admin UI: restore generated file import block, keep only the string change

---------

Co-authored-by: GAURI <174253719+gauriiiiiiiiiiii@users.noreply.github.com>

test/s3tables/catalog_olake/README.md

@@ -3,7 +3,7 @@
 An integration test for [OLake](https://github.com/datazip-inc/olake) against
 SeaweedFS's Iceberg REST Catalog, in the same shape as `catalog_clickhouse`.
 
-## Why OLake, given we already test five engines
+## Why OLake, given we already test other engines
 
 Two things here are covered by nothing else in this directory.
 
@@ -73,8 +73,9 @@ Nothing in the destination config is SeaweedFS-specific:
 ```
 
 `catalog_type` is the generic `rest`, auth is the standard OAuth2
-client-credentials flow, and `s3_path_style` does not even need setting —
-OLake turns it on by itself whenever `s3_endpoint` is non-empty. As of
+client-credentials flow, and the test config sets `s3_path_style` explicitly;
+OLake also defaults to path style whenever `s3_endpoint` is non-empty, so
+either form works. As of
 OLake v0.10.1 this works with no change on either side.
 
 ## Running it

test/s3tables/catalog_olake/olake_catalog_test.go

@@ -376,8 +376,8 @@ func (env *TestEnvironment) execSQL(t *testing.T, sqlText string) {
 // writeOLakeConfigs writes the source and destination configs. The destination
 // is the point of this test: nothing in it is SeaweedFS-specific. catalog_type
 // is the generic "rest", auth is the standard OAuth2 client-credentials flow,
-// and path-style access is not even set here because OLake turns it on by
-// itself whenever s3_endpoint is non-empty.
+// and path-style access is set explicitly here; OLake also turns it on by
+// itself whenever s3_endpoint is non-empty, so either form works.
 func (env *TestEnvironment) writeOLakeConfigs(t *testing.T) {
 	t.Helper()