align(sts): use filer /etc/ path convention for IAM storage

- Update DefaultSessionBasePath to /etc/iam/sessions (was /seaweedfs/iam/sessions)
- Update DefaultPolicyBasePath to /etc/iam/policies (was /seaweedfs/iam/policies)
- Update DefaultRoleBasePath to /etc/iam/roles (was /seaweedfs/iam/roles)
- Update iam_config_distributed.json to use /etc/iam paths
- Align with existing filer configuration structure in filer_conf.go
- Follow SeaweedFS convention of storing configs under /etc/
- Add FILER_INTEGRATION.md documenting path conventions
- Maintain consistency with IamConfigDirectory = '/etc/iam'
- Enable standard filer backup/restore procedures for IAM data
- Ensure operational consistency across SeaweedFS components

test/s3/iam/iam_config_distributed.json

@@ -7,7 +7,7 @@
     "sessionStoreType": "filer",
     "sessionStoreConfig": {
       "filerAddress": "localhost:8888",
-      "basePath": "/seaweedfs/iam/sessions"
+      "basePath": "/etc/iam/sessions"
     },
     "providers": [
       {
@@ -42,14 +42,14 @@
     "storeType": "filer",
     "storeConfig": {
       "filerAddress": "localhost:8888",
-      "basePath": "/seaweedfs/iam/policies"
+      "basePath": "/etc/iam/policies"
     }
   },
   "roleStore": {
     "storeType": "filer",
     "storeConfig": {
       "filerAddress": "localhost:8888",
-      "basePath": "/seaweedfs/iam/roles"
+      "basePath": "/etc/iam/roles"
     }
   },
 

weed/iam/sts/constants.go

@@ -21,11 +21,11 @@ const (
 	EffectDeny  = "Deny"
 )
 
-// Default Paths
+// Default Paths - aligned with filer /etc/ convention
 const (
-	DefaultSessionBasePath = "/seaweedfs/iam/sessions"
-	DefaultPolicyBasePath  = "/seaweedfs/iam/policies"
-	DefaultRoleBasePath    = "/seaweedfs/iam/roles"
+	DefaultSessionBasePath = "/etc/iam/sessions"
+	DefaultPolicyBasePath  = "/etc/iam/policies"
+	DefaultRoleBasePath    = "/etc/iam/roles"
 )
 
 // Default Values