feat(cms): integrate global layout with CMS and document decision

- Move site-config and navigation to CMS-backed SiteConfigProvider
- Keep static constants as fallback for dev and degraded modes
- Add ADR-0005 recording the global layout CMS strategy

Refs ADR-0005

src/lib/cms/content-types.ts

@@ -233,17 +233,19 @@ const solutionFields: FieldDefinition[] = [
 
 const heroBannerFields: FieldDefinition[] = [
   {
-    name: 'heading',
+    name: 'headingTop',
     type: 'text',
-    label: '主标题',
+    label: '顶部小标题',
     required: true,
+    description: '显示在主标题上方的引导语',
     ui: { width: 'full' },
   },
   {
-    name: 'subheading',
-    type: 'textarea',
-    label: '副标题',
+    name: 'headingBottom',
+    type: 'text',
+    label: '主标题',
     required: true,
+    description: 'Hero 区核心大标题',
     ui: { width: 'full' },
   },
   {
@@ -252,36 +254,48 @@ const heroBannerFields: FieldDefinition[] = [
     label: '描述文本',
   },
   {
-    name: 'primaryCtaText',
+    name: 'ctaLabel',
     type: 'text',
     label: '主按钮文案',
-    defaultValue: '了解更多',
+    defaultValue: '预约咨询',
   },
   {
-    name: 'primaryCtaLink',
+    name: 'ctaHref',
     type: 'text',
     label: '主按钮链接',
-    defaultValue: '/solutions',
-  },
-  {
-    name: 'secondaryCtaText',
-    type: 'text',
-    label: '副按钮文案',
-    defaultValue: '联系我们',
-  },
-  {
-    name: 'secondaryCtaLink',
-    type: 'text',
-    label: '副按钮链接',
     defaultValue: '/contact',
   },
+  {
+    name: 'statValue',
+    type: 'text',
+    label: '统计数值',
+    description: 'Hero 区右侧可选数据指标，如「500+」',
+  },
+  {
+    name: 'statSubtext',
+    type: 'text',
+    label: '统计说明',
+    description: '与统计数值配套的说明文字',
+  },
+  {
+    name: 'ctaTitleLine1',
+    type: 'text',
+    label: 'CTA 标题第一行',
+    description: '底部 CTA 区域第一行标题',
+  },
+  {
+    name: 'ctaTitleLine2',
+    type: 'text',
+    label: 'CTA 标题第二行',
+    description: '底部 CTA 区域第二行标题（通常使用品牌红色）',
+  },
   {
     name: 'theme',
     type: 'text',
     label: '主题风格',
     defaultValue: 'brand',
     options: [
-      { label: '品牌绿', value: 'brand' },
+      { label: '品牌红', value: 'brand' },
       { label: '蓝', value: 'blue' },
       { label: '青', value: 'teal' },
       { label: '琥珀', value: 'amber' },

src/lib/cms/types.ts

@@ -14,6 +14,11 @@ export interface CaseStudyData {
   testimonial?: CaseTestimonial;
   color: 'brand' | 'blue' | 'teal' | 'amber' | 'purple';
   featured?: boolean;
+  projectDuration?: string;
+  departments?: string[];
+  dataScale?: string;
+  businessProblem?: string;
+  verified?: boolean;
 }
 
 export type FieldType =