BREAKING CHANGE(core): rebrand from smarts3 to smartstorage

- Package renamed from @push.rocks/smarts3 to @push.rocks/smartstorage
- Class: Smarts3 → SmartStorage, Interface: ISmarts3Config → ISmartStorageConfig
- Method: getS3Descriptor → getStorageDescriptor
- Rust binary: rusts3 → ruststorage
- Rust types: S3Error→StorageError, S3Action→StorageAction, S3Config→SmartStorageConfig, S3Server→StorageServer
- On-disk file extension: ._S3_object → ._storage_object
- Default credentials: S3RVER → STORAGE
- All internal S3 branding removed; AWS S3 protocol compatibility fully maintained

rust/src/error.rs

@@ -0,0 +1,106 @@
+use hyper::StatusCode;
+
+#[derive(Debug, thiserror::Error)]
+#[error("StorageError({code}): {message}")]
+pub struct StorageError {
+    pub code: String,
+    pub message: String,
+    pub status: StatusCode,
+}
+
+impl StorageError {
+    pub fn new(code: &str, message: &str, status: StatusCode) -> Self {
+        Self {
+            code: code.to_string(),
+            message: message.to_string(),
+            status,
+        }
+    }
+
+    pub fn no_such_key() -> Self {
+        Self::new("NoSuchKey", "The specified key does not exist.", StatusCode::NOT_FOUND)
+    }
+
+    pub fn no_such_bucket() -> Self {
+        Self::new("NoSuchBucket", "The specified bucket does not exist", StatusCode::NOT_FOUND)
+    }
+
+    pub fn bucket_not_empty() -> Self {
+        Self::new("BucketNotEmpty", "The bucket you tried to delete is not empty", StatusCode::CONFLICT)
+    }
+
+    pub fn access_denied() -> Self {
+        Self::new("AccessDenied", "Access Denied", StatusCode::FORBIDDEN)
+    }
+
+    pub fn no_such_upload() -> Self {
+        Self::new("NoSuchUpload", "The specified upload does not exist", StatusCode::NOT_FOUND)
+    }
+
+    pub fn invalid_part_number() -> Self {
+        Self::new("InvalidPartNumber", "Part number must be between 1 and 10000", StatusCode::BAD_REQUEST)
+    }
+
+    pub fn internal_error(msg: &str) -> Self {
+        Self::new("InternalError", msg, StatusCode::INTERNAL_SERVER_ERROR)
+    }
+
+    pub fn invalid_request(msg: &str) -> Self {
+        Self::new("InvalidRequest", msg, StatusCode::BAD_REQUEST)
+    }
+
+    pub fn signature_does_not_match() -> Self {
+        Self::new(
+            "SignatureDoesNotMatch",
+            "The request signature we calculated does not match the signature you provided.",
+            StatusCode::FORBIDDEN,
+        )
+    }
+
+    pub fn invalid_access_key_id() -> Self {
+        Self::new(
+            "InvalidAccessKeyId",
+            "The AWS Access Key Id you provided does not exist in our records.",
+            StatusCode::FORBIDDEN,
+        )
+    }
+
+    pub fn request_time_too_skewed() -> Self {
+        Self::new(
+            "RequestTimeTooSkewed",
+            "The difference between the request time and the current time is too large.",
+            StatusCode::FORBIDDEN,
+        )
+    }
+
+    pub fn authorization_header_malformed() -> Self {
+        Self::new(
+            "AuthorizationHeaderMalformed",
+            "The authorization header is malformed.",
+            StatusCode::BAD_REQUEST,
+        )
+    }
+
+    pub fn missing_security_header(msg: &str) -> Self {
+        Self::new("MissingSecurityHeader", msg, StatusCode::BAD_REQUEST)
+    }
+
+    pub fn no_such_bucket_policy() -> Self {
+        Self::new(
+            "NoSuchBucketPolicy",
+            "The bucket policy does not exist.",
+            StatusCode::NOT_FOUND,
+        )
+    }
+
+    pub fn malformed_policy(msg: &str) -> Self {
+        Self::new("MalformedPolicy", msg, StatusCode::BAD_REQUEST)
+    }
+
+    pub fn to_xml(&self) -> String {
+        format!(
+            "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>{}</Code><Message>{}</Message></Error>",
+            self.code, self.message
+        )
+    }
+}