feat(frontend): 移除万华相关元素并更新门户登录展示

统一清理前端万华相关文案与公司展示口径为滨化集团，移除登录与门户页角色选框，并同步更新全量页面截图及Word汇总文档。

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

front-end/src/app/pages/LoginPage.tsx

@@ -8,20 +8,11 @@ import { XiaobinAssistant } from "../components/XiaobinAssistant";
 
 type Mode = "employee" | "vendor";
 type Tab = "account" | "mobile";
-type LoginRole = "purchaser" | "supplier" | "expert" | "other";
-
-const ROLE_BUTTONS: { id: LoginRole; label: string; en: string }[] = [
-  { id: "purchaser", label: "采购人", en: "Purchaser" },
-  { id: "supplier", label: "供应商", en: "Supplier" },
-  { id: "expert", label: "专家", en: "Expert" },
-  { id: "other", label: "其他", en: "Other" },
-];
 
 export function LoginPage() {
   const navigate = useNavigate();
   const [mode, setMode] = useState<Mode>("vendor");
   const [tab, setTab] = useState<Tab>("account");
-  const [loginRole, setLoginRole] = useState<LoginRole>("supplier");
   const [account, setAccount] = useState("zhangwei");
   const [pwd, setPwd] = useState("123456");
   const [showPwd, setShowPwd] = useState(false);
@@ -51,25 +42,13 @@ export function LoginPage() {
   function submit(e: React.FormEvent) {
     e.preventDefault();
     if (mode === "employee") {
-      toast.info("正在跳转至集团 IAM 统一身份认证…");
+      toast.info("正在跳转至滨化集团 IAM 统一身份认证…");
       setTimeout(() => navigate("/app"), 800);
       return;
     }
     navigate("/app");
   }
 
-  function selectRole(role: LoginRole) {
-    setLoginRole(role);
-    // 与现有登录逻辑联动：供应商走外部账号，其他角色默认走内部员工
-    if (role === "supplier") {
-      setMode("vendor");
-      setTab("account");
-    } else {
-      setMode("employee");
-      setTab("account");
-    }
-  }
-
   return (
     <div className="min-h-screen bg-[#f3f5f8]">
       <header className="border-b bg-[#0f4ea6] text-white">
@@ -90,26 +69,6 @@ export function LoginPage() {
             <Link to="/register" className="ml-1 text-primary hover:underline">去注册</Link>
           </p>
 
-          {/* 角色登录按钮：对齐万华站点风格 */}
-          <div className="mt-4 grid grid-cols-2 gap-2">
-            {ROLE_BUTTONS.map((r) => (
-              <button
-                key={r.id}
-                type="button"
-                onClick={() => selectRole(r.id)}
-                className={cn(
-                  "border px-3 py-3 text-center transition-colors",
-                  loginRole === r.id
-                    ? "border-primary bg-[#eef5ff] text-primary"
-                    : "border-[#d9dee7] bg-white text-[#374151] hover:border-primary/60 hover:bg-[#f8fbff]",
-                )}
-              >
-                <div className="text-sm font-medium leading-none">{r.label}</div>
-                <div className="mt-1 text-[11px] text-[#6b7280]">{r.en}</div>
-              </button>
-            ))}
-          </div>
-
           <div className="mt-4 flex border bg-[#f8fafc] p-1">
             {(
               [
@@ -130,10 +89,6 @@ export function LoginPage() {
               </button>
             ))}
           </div>
-          <p className="mt-1 text-[11px] text-muted-foreground">
-            当前角色：{ROLE_BUTTONS.find((x) => x.id === loginRole)?.label}
-          </p>
-
           <div className="mt-3 flex border-b border-border">
             {(
               [
@@ -279,8 +234,8 @@ export function LoginPage() {
               {[
                 ["[公开招标] 扣电测试柜框架", "2026-07-13"],
                 ["[公开招标] 2026年橡胶密封件框架招标O型圈", "2026-07-13"],
-                ["[公开招标] 万华莱州100MW分散式风电项目EPC工程总承包[变更公告]", "2026-07-13"],
-                ["[公开招标] 万华旋塞阀框架包一 金属旋塞阀、包二 衬氟旋塞阀", "2026-07-10"],
+                ["[公开招标] 莱州100MW分散式风电项目EPC工程总承包[变更公告]", "2026-07-13"],
+                ["[公开招标] 旋塞阀框架包一 金属旋塞阀、包二 衬氟旋塞阀", "2026-07-10"],
                 ["[公开招标] 改性TPU熟化料仓", "2026-07-09"],
               ].map(([title, date]) => (
                 <li key={title} className="flex items-center gap-3 border-b border-dashed py-1.5">
@@ -295,9 +250,9 @@ export function LoginPage() {
             <div className="border bg-white">
               <div className="border-b bg-[#f8fafc] px-4 py-3 text-sm font-semibold">通知公告</div>
               <div className="space-y-1 p-4 text-sm text-muted-foreground">
-                <p>万华蓬莱园区高温管道耐火衬里类物资供应商招募</p>
-                <p>万华化学桨叶冷却机类供应商招募</p>
-                <p>万华化学洗车平台服务类供应商招募</p>
+                <p>蓬莱园区高温管道耐火衬里类物资供应商招募</p>
+                <p>化学桨叶冷却机类供应商招募</p>
+                <p>化学洗车平台服务类供应商招募</p>
               </div>
             </div>
             <div className="border bg-white">