chore: initial commit of ai site platform

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

platform/internal/agentcap/capsule_test.go

@@ -0,0 +1,36 @@
+package agentcap
+
+import (
+	"testing"
+)
+
+func TestEncryptDecrypt(t *testing.T) {
+	key := DeriveKey("secret", 1, 2)
+	cap, err := Encrypt(key, &Descriptor{
+		Version: "1",
+		BaseURL: "http://127.0.0.1:8888",
+		AppSlug: "demo",
+		Auth:    AuthSpec{Type: "bearer_jwt", Header: "Authorization"},
+		Resources: []ResourceSpec{{
+			Name: "items", Path: "/api/v1/apps/demo/items",
+			Methods: []string{"GET", "POST"}, PrimaryKey: "id",
+			Fields: []FieldSpec{{Name: "title", Type: "string"}},
+		}},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cap[:4] != Prefix {
+		t.Fatalf("prefix: %s", cap)
+	}
+	desc, err := Decrypt(key, cap)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if desc.AppSlug != "demo" || len(desc.Resources) != 1 {
+		t.Fatalf("%+v", desc)
+	}
+	if _, err := Decrypt([]byte("bad-key-bad-key-bad-key-bad!!!!"), cap); err == nil {
+		t.Fatal("expected decrypt fail")
+	}
+}