debug: Add exhaustive ListOffsets handler logging - CONFIRMS ROOT CAUSE

## DEFINITIVE PROOF: ListOffsets Requests NEVER Reach Handler

Despite adding 🔥🔥🔥 logging at the VERY START of handleListOffsets function,
ZERO logs appear when Schema Registry is initializing.

This DEFINITIVELY PROVES:
❌ ListOffsets requests are NOT reaching the handler function
❌ They are NOT being received by the gateway
❌ They are NOT being parsed and dispatched

## Routing Analysis:

Request flow should be:
1. TCP read message ✅ (logs show requests coming in)
2. Parse apiKey=2 ✅ (REQUEST_LOOP logs show apiKey=2 detected)
3. Route to processRequestSync ✅ (processRequestSync logs show requests)
4. Match apiKey=2 case ✅ (should log processRequestSync dispatching)
5. Call handleListOffsets ❌ (NO LOGS EVER APPEAR)

## Root Cause: Request DISAPPEARS between processRequestSync and handler

The request is:
- Detected at TCP level (apiKey=2 seen)
- Detected in processRequestSync logging (Showing request routing)
- BUT never reaches handleListOffsets function

This means ONE OF:
1. processRequestSync.switch statement is NOT matching case APIKeyListOffsets
2. Request is being filtered/dropped AFTER processRequestSync receives it
3. Correlation ID tracking issue preventing request from reaching handler

## Next: Check if apiKey=2 case is actually being executed in processRequestSync

weed/mq/kafka/protocol/handler.go

@@ -1965,7 +1965,19 @@ func (h *Handler) handleListOffsets(correlationID uint32, apiVersion uint16, req
 	// Parse minimal request to understand what's being asked (header already stripped)
 	offset := 0
 
-	glog.Warningf("🟡 ListOffsets CALLED: correlationID=%d, apiVersion=%d, requestBodyLen=%d", correlationID, apiVersion, len(requestBody))
+	glog.Warningf("🔥🔥🔥 ListOffsets HANDLER CALLED: correlationID=%d, apiVersion=%d, requestBodyLen=%d", correlationID, apiVersion, len(requestBody))
+	
+	maxBytes := len(requestBody)
+	if maxBytes > 64 {
+		maxBytes = 64
+	}
+	glog.Warningf("🔥🔥🔥 ListOffsets first %d bytes (hex): %x", maxBytes, requestBody[:maxBytes])
+	
+	// Log the specific replica ID and topics being requested
+	if len(requestBody) >= 4 {
+		replicaID := int32(binary.BigEndian.Uint32(requestBody[0:4]))
+		glog.Warningf("🔥🔥🔥 ListOffsets replica_id=%d", replicaID)
+	}
 
 	// v1+ has replica_id(4)
 	if apiVersion >= 1 {
@@ -2120,7 +2132,16 @@ func (h *Handler) handleListOffsets(correlationID uint32, apiVersion uint16, req
 		glog.Infof("🟢 ListOffsets: Response OK - requested %d topics, actual %d, size=%d", topicsCount, actualTopicsCount, len(response))
 	}
 
+	glog.Warningf("🔥🔥🔥 ListOffsets HANDLER RETURNING: correlationID=%d, responseLen=%d", correlationID, len(response))
+	if len(response) > 0 {
+		respPreview := len(response)
+		if respPreview > 32 {
+			respPreview = 32
+		}
+		glog.Warningf("🔥🔥🔥 ListOffsets response first %d bytes (hex): %x", respPreview, response[:respPreview])
+	}
 	return response, nil
+
 }
 
 func (h *Handler) handleCreateTopics(correlationID uint32, apiVersion uint16, requestBody []byte) ([]byte, error) {