fix: PAR注入ctx对象(httpClient+siteUrl+auth)对齐mediabo的httpGet模式

par-core/src/main/java/com/par/core/adapter/GroovyScriptEngine.java

@@ -84,7 +84,13 @@ public class GroovyScriptEngine {
             binding.setVariable("json", objectMapper);
             binding.setVariable("utils", new ScriptUtils());
             binding.setVariable("http", new HttpHelper(httpClient));
-            if (siteCtx != null) binding.setVariable("_ctx", siteCtx);
+            // 提供 ctx 对象，使 httpGet(ctx, path) 在 PAR 和 mediabo 中用法一致
+            Map<String, Object> ctx = new HashMap<>();
+            ctx.put("httpClient", httpClient);
+            if (siteCtx != null) {
+                ctx.putAll(siteCtx);  // siteUrl, auth
+            }
+            binding.setVariable("ctx", ctx);
 
             GroovyShell shell = new GroovyShell(classLoader, binding);
             String fullScript = SCRIPT_PREFIX + groovyScript + "\n// PAR 调用入口\nreturn parse(content, url)";