chore: initial commit of ai site platform

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

platform/internal/userstore/creds_test.go

@@ -0,0 +1,51 @@
+package userstore
+
+import (
+	"context"
+	"testing"
+)
+
+func TestRandomUsernameUnique(t *testing.T) {
+	seen := map[string]struct{}{}
+	for i := 0; i < 20; i++ {
+		u, err := RandomUsername()
+		if err != nil || len(u) != 10 {
+			t.Fatalf("got %q %v", u, err)
+		}
+		if u[0] < 'a' || u[0] > 'z' {
+			t.Fatalf("must start with letter: %q", u)
+		}
+		seen[u] = struct{}{}
+	}
+	if len(seen) < 15 {
+		t.Fatalf("expected diverse usernames, got %d", len(seen))
+	}
+}
+
+func TestCreateMemberAndChangePassword(t *testing.T) {
+	s := NewMemoryStore()
+	ten, err := s.CreateTenant(context.Background(), "测试公司", "acme")
+	if err != nil {
+		t.Fatal(err)
+	}
+	uname, err := AllocUniqueUsername(context.Background(), s.UsernameExists)
+	if err != nil {
+		t.Fatal(err)
+	}
+	u, plain, err := s.CreateMember(context.Background(), ten.TenantID, uname, "", "管理员", "管理员", 0)
+	if err != nil || plain == "" {
+		t.Fatalf("u=%v plain=%q err=%v", u, plain, err)
+	}
+	if _, err := s.Login(context.Background(), uname, plain); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.ChangePassword(context.Background(), u.UserID, plain, "newpass99"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.Login(context.Background(), uname, "newpass99"); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.ChangePassword(context.Background(), u.UserID, "wrong", "x"); err == nil {
+		t.Fatal("expected old password check")
+	}
+}