feat: 补全剩余 6 个 StreamField Block 前端渲染 (ProductCard/Pricing/Timeline/Team/TechStack/Video)

- types/wagtail.ts 新增对应 6 个 Block 值类型接口及 StreamFieldBlock 联合类型分支
- 新建 6 个渲染组件：ProductCardGrid/Pricing/Timeline/Team/TechStack/Video，风格与既有 Block 一致
- BlockRenderer.tsx 映射表接入新组件，key 与后端 COMMON_BLOCKS 保持一致
- lint/build 均验证通过

blocks/timeline/Timeline.tsx

@@ -0,0 +1,24 @@
+import type { TimelineBlockValue } from "@/types/wagtail";
+
+export default function Timeline({ value }: { value: TimelineBlockValue }) {
+  return (
+    <section className="py-24">
+      <div className="mx-auto max-w-4xl px-6">
+        {value.heading && (
+          <h2 className="mb-16 text-4xl font-bold text-slate-900">{value.heading}</h2>
+        )}
+        <ol className="relative space-y-10 border-l border-slate-200 pl-8">
+          {value.items?.map((item, index) => (
+            <li key={`${item.year}-${index}`} className="relative">
+              <span className="absolute -left-[2.35rem] top-1 h-3 w-3 rounded-full bg-primary" />
+              <div className="mb-1 text-lg font-semibold text-primary">
+                {item.year}
+              </div>
+              <p className="text-slate-600">{item.event}</p>
+            </li>
+          ))}
+        </ol>
+      </div>
+    </section>
+  );
+}