feat: implements fiber panic recovery

Fiber includes a built-in panic recovery middleware that catches panics in route handlers and middlewares, preventing the server from crashing and allowing it to recover. Alongside this, a stack trace handler has been implemented to store system panics in the context locals (stack).

Both the S3 API server and the Admin server use a global error handler to catch unexpected exceptions and recovered panics. The middleware’s logic is to log the panic or internal error and return an S3-style internal server error response.

Additionally, dedicated **Panic** and **InternalError** loggers have been added to the `s3api` debug logger to record system panics and internal errors in the console.

s3api/utils/context-keys.go

@@ -19,7 +19,7 @@ import (
 )
 
 // Region, StartTime, IsRoot, Account, AccessKey context locals
-// are set to defualut values in middlewares.SetDefaultValues
+// are set to default values in middlewares.SetDefaultValues
 // to avoid the nil interface conversions
 type ContextKey string
 
@@ -35,6 +35,7 @@ const (
 	ContextKeySkipResBodyLog ContextKey = "skip-res-body-log"
 	ContextKeyBodyReader     ContextKey = "body-reader"
 	ContextKeySkip           ContextKey = "__skip"
+	ContextKeyStack          ContextKey = "stack"
 )
 
 func (ck ContextKey) Values() []ContextKey {