feat: 添加break和continue语句的支持，更新解析器、解释器和词法分析器以处理相关语法

src/parser/parser.rs

@@ -39,6 +39,10 @@ impl Parser {
             self.while_statement()
         } else if self.match_kind(&[TokenKind::For]) {
             self.for_statement()
+        } else if self.match_kind(&[TokenKind::Break]) {
+            self.break_statement()
+        } else if self.match_kind(&[TokenKind::Continue]) {
+            self.continue_statement()
         } else if self.match_kind(&[TokenKind::Return]) {
             self.return_statement()
         } else if self.match_kind(&[TokenKind::LeftBrace]) {
@@ -153,6 +157,16 @@ impl Parser {
         }
     }
 
+    fn break_statement(&mut self) -> Stmt {
+        self.match_kind(&[TokenKind::Semicolon]); // 分号可选
+        Stmt::Break
+    }
+
+    fn continue_statement(&mut self) -> Stmt {
+        self.match_kind(&[TokenKind::Semicolon]); // 分号可选
+        Stmt::Continue
+    }
+
     fn return_statement(&mut self) -> Stmt {
         let value = if !self.check(&TokenKind::Semicolon) && !self.check(&TokenKind::RightBrace) {
             Some(self.expression())