fix: Lexer 支持 -- 行注释和块注释，修复演示页解析报错

dist/metona-sqlark.esm.js

@@ -1940,6 +1940,16 @@ class Lexer {
                 tok = { type: TokenType.EOF, value: '', position: this.position };
                 break;
             default:
+                // SQL 注释: -- 行注释
+                if (this.ch === '-' && this.peekChar() === '-') {
+                    this.skipLineComment();
+                    return this.nextToken();
+                }
+                // SQL 注释: /* 块注释 */
+                if (this.ch === '/' && this.peekChar() === '*') {
+                    this.skipBlockComment();
+                    return this.nextToken();
+                }
                 if (this.isLetter(this.ch)) {
                     const ident = this.readIdentifier();
                     const keyword = KEYWORDS[ident.toUpperCase()];
@@ -1988,6 +1998,24 @@ class Lexer {
             this.readChar();
         }
     }
+    /** 跳过 -- 行注释到行尾 */
+    skipLineComment() {
+        while (this.ch !== '\n' && this.ch !== '\r' && this.ch !== '') {
+            this.readChar();
+        }
+    }
+    /** 跳过块注释 slash-star ... star-slash */
+    skipBlockComment() {
+        this.readChar(); // skip *
+        this.readChar(); // move past *
+        while (this.ch !== '' && !(this.ch === '*' && this.peekChar() === '/')) {
+            this.readChar();
+        }
+        if (this.ch !== '') {
+            this.readChar(); // skip *
+            this.readChar(); // skip /
+        }
+    }
     readIdentifier() {
         const start = this.position;
         while (this.isLetter(this.ch) || this.isDigit(this.ch) || this.ch === '_') {