feat(iam): add SetUserStatus and UpdateAccessKey actions (#7750)

feat(iam): add SetUserStatus and UpdateAccessKey actions (#7745)

Add ability to enable/disable users and access keys without deleting them.

## Changes

### Protocol Buffer Updates
- Add `disabled` field (bool) to Identity message for user status
  - false (default) = enabled, true = disabled
  - No backward compatibility hack needed since zero value is correct
- Add `status` field (string: Active/Inactive) to Credential message

### New IAM Actions
- SetUserStatus: Enable or disable a user (requires admin)
- UpdateAccessKey: Change access key status (self-service or admin)

### Behavior
- Disabled users: All API requests return AccessDenied
- Inactive access keys: Signature validation fails
- Status check happens early in auth flow for performance
- Backward compatible: existing configs default to enabled (disabled=false)

### Use Cases
1. Temporary suspension: Disable user access during investigation
2. Key rotation: Deactivate old key before deletion
3. Offboarding: Disable rather than delete for audit purposes
4. Emergency response: Quickly disable compromised credentials

Fixes #7745

weed/iam/constants.go

@@ -29,3 +29,9 @@ const (
 	AccessKeyIdLength     = 21
 	SecretAccessKeyLength = 42
 )
+
+// Access key status values (AWS IAM compatible)
+const (
+	AccessKeyStatusActive   = "Active"
+	AccessKeyStatusInactive = "Inactive"
+)

weed/iam/responses.go

@@ -138,3 +138,15 @@ type Policies struct {
 	Policies map[string]interface{} `json:"policies"`
 }
 
+// SetUserStatusResponse is the response for SetUserStatus action.
+// This is a SeaweedFS extension to enable/disable users without deleting them.
+type SetUserStatusResponse struct {
+	CommonResponse
+	XMLName xml.Name `xml:"https://iam.amazonaws.com/doc/2010-05-08/ SetUserStatusResponse"`
+}
+
+// UpdateAccessKeyResponse is the response for UpdateAccessKey action.
+type UpdateAccessKeyResponse struct {
+	CommonResponse
+	XMLName xml.Name `xml:"https://iam.amazonaws.com/doc/2010-05-08/ UpdateAccessKeyResponse"`
+}