s3api: fix static IAM policy enforcement after reload (#8532)

* s3api: honor attached IAM policies over legacy actions

* s3api: hydrate IAM policy docs during config reload

* s3api: use policy-aware auth when listing buckets

* credential: propagate context through filer_etc policy reads

* credential: make legacy policy deletes durable

* s3api: exercise managed policy runtime loader

* s3api: allow static IAM users without session tokens

* iam: deny unmatched attached policies under default allow

* iam: load embedded policy files from filer store

* s3api: require session tokens for IAM presigning

* s3api: sync runtime policies into zero-config IAM

* credential: respect context in policy file loads

* credential: serialize legacy policy deletes

* iam: align filer policy store naming

* s3api: use authenticated principals for presigning

* iam: deep copy policy conditions

* s3api: require request creation in policy tests

* filer: keep ReadInsideFiler as the context-aware API

* iam: harden filer policy store writes

* credential: strengthen legacy policy serialization test

* credential: forward runtime policy loaders through wrapper

* s3api: harden runtime policy merging

* iam: require typed already-exists errors

weed/mq/offset/filer_storage.go

@@ -1,6 +1,7 @@
 package offset
 
 import (
+	"context"
 	"fmt"
 	"time"
 
@@ -48,7 +49,7 @@ func (f *FilerOffsetStorage) LoadCheckpoint(namespace, topicName string, partiti
 
 	var offset int64 = -1
 	err := f.filerClientAccessor.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
-		data, err := filer.ReadInsideFiler(client, partitionDir, fileName)
+		data, err := filer.ReadInsideFiler(context.Background(), client, partitionDir, fileName)
 		if err != nil {
 			return err
 		}