feat: 添加数组字面量和索引访问功能，更新解析器和解释器以支持数组操作

src/lexer/lexer.rs

@@ -61,6 +61,8 @@ impl Lexer {
             '*' => TokenKind::Star,
             '.' => TokenKind::Dot,
             ':' => TokenKind::Colon,
+            '[' => TokenKind::LeftBracket,
+            ']' => TokenKind::RightBracket,
 
             '/' => {
                 if self.match_char('/') {