fix(ai): handle SSE data prefix without space and add query logging

The SSE spec treats the space after "data:" as optional. Update the
prefix check to match "data:" instead of "data: " so responses parse
correctly regardless of spacing. Also add info-level logging for query
command results.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: AnnatarHe

commands/query.go

@@ -101,6 +101,7 @@ func commandQuery(c *cli.Context) error {
 
 	// Print newline after streaming
 	fmt.Println()
+	slog.InfoContext(ctx, "query command", "command", result.String())
 
 	newCommand := strings.TrimSpace(result.String())
 

model/ai_service.go

@@ -69,8 +69,8 @@ func (s *sseAIService) QueryCommandStream(
 			continue
 		}
 
-		if strings.HasPrefix(line, "data: ") {
-			data := line[len("data: "):]
+		if strings.HasPrefix(line, "data:") {
+			data := line[len("data:"):]
 
 			if isError {
 				return fmt.Errorf("server error: %s", data)