fix(feishu): accept groupPolicy "allowall" as alias for "open" (#36358)

* fix(feishu): accept groupPolicy "allowall" as alias for "open"

When users configure groupPolicy: "allowall" in Feishu channel config,
the Zod schema rejects the value and the runtime policy check falls
through to the allowlist path.  With an empty allowFrom array, all group
messages are silently dropped despite the intended "allow all" semantics.

Accept "allowall" at the schema level (transform to "open") and add a
runtime guard in isFeishuGroupAllowed so the value is handled even if it
bypasses schema validation.

Closes #36312

Made-with: Cursor

* Feishu: tighten allowall alias handling and coverage

---------

Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

extensions/feishu/src/policy.test.ts

@@ -110,5 +110,45 @@ describe("feishu policy", () => {
         }),
       ).toBe(true);
     });
+
+    it("allows group when groupPolicy is 'open'", () => {
+      expect(
+        isFeishuGroupAllowed({
+          groupPolicy: "open",
+          allowFrom: [],
+          senderId: "oc_group_999",
+        }),
+      ).toBe(true);
+    });
+
+    it("treats 'allowall' as equivalent to 'open'", () => {
+      expect(
+        isFeishuGroupAllowed({
+          groupPolicy: "allowall",
+          allowFrom: [],
+          senderId: "oc_group_999",
+        }),
+      ).toBe(true);
+    });
+
+    it("rejects group when groupPolicy is 'disabled'", () => {
+      expect(
+        isFeishuGroupAllowed({
+          groupPolicy: "disabled",
+          allowFrom: ["oc_group_999"],
+          senderId: "oc_group_999",
+        }),
+      ).toBe(false);
+    });
+
+    it("rejects group when groupPolicy is 'allowlist' and allowFrom is empty", () => {
+      expect(
+        isFeishuGroupAllowed({
+          groupPolicy: "allowlist",
+          allowFrom: [],
+          senderId: "oc_group_999",
+        }),
+      ).toBe(false);
+    });
   });
 });