feat: localize optimizer interface

src/app/page.tsx

@@ -55,12 +55,12 @@ export default function Home() {
         body: JSON.stringify(input),
       });
       const body = await response.json();
-      if (!response.ok) throw new Error(body.error ?? "Analyze failed");
+      if (!response.ok) throw new Error(body.error ?? "分析失败");
       setJobId(body.job.id);
       setFactCard(body.candidateFactCard);
-      setMessage("Candidate fact card created.");
+      setMessage("候选事实卡已生成。");
     } catch (error) {
-      setMessage(error instanceof Error ? error.message : "Analyze failed");
+      setMessage(error instanceof Error ? error.message : "分析失败");
     } finally {
       setBusyAction(null);
     }
@@ -77,11 +77,11 @@ export default function Home() {
         body: JSON.stringify(toConfirmedFactCard(factCard)),
       });
       const body = await response.json();
-      if (!response.ok) throw new Error(body.error ?? "Confirm failed");
+      if (!response.ok) throw new Error(body.error ?? "确认失败");
       setFactCard(body.factCard);
-      setMessage("Fact card confirmed.");
+      setMessage("事实卡已确认。");
     } catch (error) {
-      setMessage(error instanceof Error ? error.message : "Confirm failed");
+      setMessage(error instanceof Error ? error.message : "确认失败");
     } finally {
       setBusyAction(null);
     }
@@ -96,16 +96,16 @@ export default function Home() {
         method: "POST",
       });
       const body = await response.json();
-      if (!response.ok) throw new Error(body.error ?? "Optimize failed");
+      if (!response.ok) throw new Error(body.error ?? "优化失败");
       setOptimizedArticle(body.optimizedArticle);
       setQaReport(body.qaReport);
       setMessage(
         body.qaReport.overall_status === "fail"
-          ? "QA found hard failures; export is blocked."
-          : "Optimization complete.",
+          ? "质检发现硬性失败，已阻止导出。"
+          : "优化完成。",
       );
     } catch (error) {
-      setMessage(error instanceof Error ? error.message : "Optimize failed");
+      setMessage(error instanceof Error ? error.message : "优化失败");
     } finally {
       setBusyAction(null);
     }
@@ -115,7 +115,7 @@ export default function Home() {
     <main className="app-shell">
       <header className="topbar">
         <div>
-          <h1>GEO Agent Article Optimizer</h1>
+          <h1>GEO 智能文章优化器</h1>
           {message && <p>{message}</p>}
         </div>
         <button
@@ -123,7 +123,7 @@ export default function Home() {
           onClick={optimize}
           type="button"
         >
-          {busyAction === "optimize" ? "Optimizing..." : "Optimize"}
+          {busyAction === "optimize" ? "优化中..." : "开始优化"}
         </button>
       </header>
       <div className="workflow-grid">