feat: implement heal subsystem for automatic data repair

- Add heal module with core types (HealType, HealRequest, HealTask)
- Implement HealManager for task scheduling and execution
- Add HealStorageAPI trait and ECStoreHealStorage implementation
- Integrate heal capabilities into scanner for automatic repair
- Support multiple heal types: object, bucket, disk, metadata, MRF, EC decode
- Add progress tracking and event system for heal operations
- Merge heal and scanner error types for unified error handling
- Include comprehensive logging and metrics for heal operations

Signed-off-by: junxiang Mu <1948535941@qq.com>

crates/ahm/src/error.rs

@@ -14,8 +14,10 @@
 
 use thiserror::Error;
 
+/// RustFS AHM/Heal/Scanner 统一错误类型
 #[derive(Debug, Error)]
 pub enum Error {
+    // 通用
     #[error("I/O error: {0}")]
     Io(#[from] std::io::Error),
 
@@ -25,21 +27,65 @@ pub enum Error {
     #[error("Configuration error: {0}")]
     Config(String),
 
+    #[error("Heal configuration error: {message}")]
+    ConfigurationError { message: String },
+
+    #[error("Other error: {0}")]
+    Other(String),
+
+    #[error(transparent)]
+    Anyhow(#[from] anyhow::Error),
+
+    // Scanner相关
     #[error("Scanner error: {0}")]
     Scanner(String),
 
     #[error("Metrics error: {0}")]
     Metrics(String),
 
-    #[error(transparent)]
-    Other(#[from] anyhow::Error),
+    // Heal相关
+    #[error("Heal task not found: {task_id}")]
+    TaskNotFound { task_id: String },
+
+    #[error("Heal task already exists: {task_id}")]
+    TaskAlreadyExists { task_id: String },
+
+    #[error("Heal manager is not running")]
+    ManagerNotRunning,
+
+    #[error("Heal task execution failed: {message}")]
+    TaskExecutionFailed { message: String },
+
+    #[error("Invalid heal type: {heal_type}")]
+    InvalidHealType { heal_type: String },
+
+    #[error("Heal task cancelled")]
+    TaskCancelled,
+
+    #[error("Heal task timeout")]
+    TaskTimeout,
+
+    #[error("Heal event processing failed: {message}")]
+    EventProcessingFailed { message: String },
+
+    #[error("Heal progress tracking failed: {message}")]
+    ProgressTrackingFailed { message: String },
 }
 
 pub type Result<T, E = Error> = std::result::Result<T, E>;
 
-// Implement conversion from ahm::Error to std::io::Error for use in main.rs
+impl Error {
+    pub fn other<E>(error: E) -> Self
+    where
+        E: Into<Box<dyn std::error::Error + Send + Sync>>,
+    {
+        Error::Other(error.into().to_string())
+    }
+}
+
+// 可选：实现与 std::io::Error 的互转
 impl From<Error> for std::io::Error {
     fn from(err: Error) -> Self {
         std::io::Error::other(err)
     }
-}
+}