feat(cms): 品牌叙事与结构性文案全站 CMS 化并补齐信任证据阶段 0

- 品牌叙事内核（价值主张/定位/承诺/三支柱/语气）下沉 site-config，经 SiteConfigProvider 注入全站
- 新增 page-copy 内容模型承载结构性文案（章节标题/眉标/描述/CTA/空状态），覆盖首页+服务/方案/产品/案例/新闻列表页，「CMS 优先 + 硬编码兜底」不白屏
- 首页「首批客户共创计划」板块（earlyAccessTitle/CtaLabel/Status 驱动）替代单行标签，如实呈现共创/内测/授权公开三档状态
- 关于页资质区数据空时如实展示「建设中」空态
- 零编造：不虚构客户/数据/资质

src/app/(marketing)/cases/cases-content-v3.tsx

@@ -95,14 +95,23 @@ function CaseCard({ caseItem, index }: { caseItem: CaseStudy; index: number }) {
 export default function CasesContentV3({
   cases: casesProp,
   industries: industriesProp,
+  pageCopy,
 }: {
   cases?: CaseStudy[];
   industries?: { id: string; label: string }[];
+  pageCopy?: Record<string, unknown> | null;
 }) {
   const [selectedIndustry, setSelectedIndustry] = useState('all');
 
   const industries = industriesProp ?? [];
 
+  const heroTitle1 = (pageCopy?.casePageHeroTitle1 as string) || '每一个项目，';
+  const heroTitle2 = (pageCopy?.casePageHeroTitle2 as string) || '都以成果为目标';
+  const heroDescription = (pageCopy?.casePageHeroDescription as string) || '我们正在与首批客户共同创造价值故事。\n从挑战到方案，从过程到成果——用数据说话，用结果证明。';
+  const heroDescriptionLines = heroDescription.split('\n');
+  const filterTitle = (pageCopy?.casePageFilterTitle as string) || '全部案例';
+  const filterDescription = (pageCopy?.casePageFilterDescription as string) || '按行业筛选，找到与您业务最相关的成功故事';
+
   const filteredCases = useMemo(() => {
     const allCases = casesProp ?? [];
     if (selectedIndustry === 'all') return allCases;
@@ -130,11 +139,11 @@ export default function CasesContentV3({
               transition={{ duration: 1, delay: 0.2, ease: EASE_OUT }}
               className="text-4xl sm:text-5xl md:text-6xl lg:text-7xl xl:text-8xl font-black text-ink leading-[0.88] tracking-tightest mb-10 sm:mb-12 md:mb-16"
             >
-              <div className="block">每一个项目，</div>
+              <div className="block">{heroTitle1}</div>
               <div className="block mt-4 sm:mt-6">
                 <span className="relative inline-block">
                   <span className="relative text-brand font-black">
-                    都以成果为目标
+                    {heroTitle2}
                     <motion.span
                       className="absolute -bottom-2 left-0 w-full h-[3px] bg-brand"
                       style={{ transformOrigin: 'left' }}
@@ -153,9 +162,12 @@ export default function CasesContentV3({
               transition={{ duration: 0.8, delay: 0.5, ease: EASE_OUT }}
               className="text-lg md:text-xl text-text-secondary max-w-2xl leading-relaxed mb-12"
             >
-              我们正在与首批客户共同创造价值故事。
-              <br className="hidden sm:block" />
-              从挑战到方案，从过程到成果——用数据说话，用结果证明。
+              {heroDescriptionLines.map((line, i) => (
+                <span key={i}>
+                  {i > 0 && <br className="hidden sm:block" />}
+                  {line}
+                </span>
+              ))}
             </motion.p>
 
             <motion.div
@@ -225,10 +237,10 @@ export default function CasesContentV3({
                 All Cases
               </div>
               <h2 className="text-3xl sm:text-4xl md:text-5xl lg:text-6xl font-extrabold text-ink tracking-tight leading-[0.95]">
-                全部案例
+                {filterTitle}
               </h2>
               <p className="mt-6 text-lg text-text-secondary leading-relaxed">
-                按行业筛选，找到与您业务最相关的成功故事
+                {filterDescription}
               </p>
             </motion.div>