This commit addresses the user feedback that configuration files should not
need to specify default paths when constants are available.
### Changes Made:
#### Configuration Simplification:
- Removed redundant basePath configurations from iam_config_distributed.json
- All stores now use constants for defaults:
* Sessions: /etc/iam/sessions (DefaultSessionBasePath)
* Policies: /etc/iam/policies (DefaultPolicyBasePath)
* Roles: /etc/iam/roles (DefaultRoleBasePath)
- Eliminated empty storeConfig objects entirely for cleaner JSON
#### Updated Store Implementations:
- FilerPolicyStore: Updated hardcoded path to use /etc/iam/policies
- FilerRoleStore: Updated hardcoded path to use /etc/iam/roles
- All stores consistently align with /etc/ filer convention
#### Runtime Filer Address Integration:
- Updated IAM manager methods to accept filerAddress parameter:
* AssumeRoleWithWebIdentity(ctx, filerAddress, request)
* AssumeRoleWithCredentials(ctx, filerAddress, request)
* IsActionAllowed(ctx, filerAddress, request)
* ExpireSessionForTesting(ctx, filerAddress, sessionToken)
- Enhanced S3IAMIntegration to store filerAddress from S3ApiServer
- Updated all test files to pass test filerAddress ('localhost:8888')
### Benefits:
- ✅ Cleaner, minimal configuration files
- ✅ Consistent use of well-defined constants for defaults
- ✅ No configuration needed for standard use cases
- ✅ Runtime filer address flexibility maintained
- ✅ Aligns with SeaweedFS /etc/ convention throughout
### Breaking Change:
- S3IAMIntegration constructor now requires filerAddress parameter
- All IAM manager methods now require filerAddress as second parameter
- Tests and middleware updated accordingly