fix(param-support): handle strip rules without match/drop

Cloudflare AI rule only sets flattenContent. Treat missing match as
provider-wide and missing drop as empty list to avoid crash. Fixes #1960.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/translator/concerns/paramSupport.js

@@ -16,6 +16,7 @@ const STRIP_RULES = [
 
 // Test a rule's match (regex or predicate) against the model id.
 function matches(rule, model) {
+  if (!rule.match) return true;
   return typeof rule.match === "function" ? rule.match(model) : rule.match.test(model);
 }
 
@@ -25,7 +26,7 @@ export function stripUnsupportedParams(provider, model, body) {
   for (const rule of STRIP_RULES) {
     if (rule.provider && rule.provider !== provider) continue;
     if (!matches(rule, model)) continue;
-    for (const key of rule.drop) {
+    for (const key of rule.drop || []) {
       if (body[key] !== undefined) delete body[key];
     }
     // CF Workers AI oneOf root schema only accepts content as plain string (#1926)