fix: 完善首页和详情页国际化实现

- 首页 hero 区域标题和描述使用 i18n 翻译
- 首页 "BROWSE BY TAGS" 和 "FEATURED PROJECTS" 使用 i18n 翻译
- 详情页 "BACK TO PROJECTS" 使用 i18n 翻译
- 添加缺失的中英文翻译键

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/app/[locale]/page.tsx

@@ -28,10 +28,10 @@ export default async function HomePage({ params }: HomePageProps) {
 
         <section className="max-w-4xl mx-auto px-4 py-20 text-center relative z-10">
           <h1 className="font-display text-5xl md:text-7xl font-bold mb-6 tracking-tight leading-tight">
-            AI PROJECT <br className="hidden md:block" />NAVIGATOR
+            {t('heroTitle')} <br className="hidden md:block" />{t('heroTitle2')}
           </h1>
           <p className="text-lg md:text-xl text-gray-600 dark:text-gray-300 mb-10 max-w-2xl mx-auto font-sans">
-            Discover and explore high-quality AI projects from across the web. Curated for developers and enthusiasts.
+            {t('heroDescription')}
           </p>
           <Suspense fallback={<div className="h-16"></div>}>
             <SearchBar
@@ -45,7 +45,7 @@ export default async function HomePage({ params }: HomePageProps) {
         {/* Browse by Tags Section */}
         <section className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 mb-16">
           <h2 className="font-display text-xl font-bold mb-6 border-b-2 border-black dark:border-gray-700 pb-2 inline-block">
-            BROWSE BY TAGS
+            {t('browseByTagsSection')}
           </h2>
           <TagCloud tags={tags} locale={locale} />
         </section>
@@ -53,16 +53,16 @@ export default async function HomePage({ params }: HomePageProps) {
         {/* Featured Projects Section */}
         <section className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 pb-24">
           <div className="flex items-end justify-between mb-8">
-            <h2 className="font-display text-3xl font-bold">FEATURED PROJECTS</h2>
+            <h2 className="font-display text-3xl font-bold">{t('featuredProjectsSection')}</h2>
             <a className="hidden md:flex items-center font-display text-sm font-bold hover:underline" href={`/${locale}/projects`}>
-              VIEW ALL <span className="ml-1">→</span>
+              {t('viewAll')} <span className="ml-1">→</span>
             </a>
           </div>
           <ProjectList projects={projectsData.projects} locale={locale} featured />
 
           <div className="mt-8 text-center md:hidden">
             <a className="inline-flex items-center font-display text-sm font-bold border-b-2 border-black dark:border-white pb-1" href={`/${locale}/projects`}>
-              VIEW ALL PROJECTS <span className="ml-1">→</span>
+              {t('viewAllProjects')} <span className="ml-1">→</span>
             </a>
           </div>
         </section>

src/app/[locale]/projects/[id]/page.tsx

@@ -1,4 +1,5 @@
 import { notFound } from 'next/navigation'
+import { getTranslations } from 'next-intl/server'
 import { getProjectBySlug, getProjects } from '@/hooks/useProjects'
 import { ProjectDetail } from '@/components/project/ProjectDetail'
 import { ProjectSidebar } from '@/components/project/ProjectSidebar'
@@ -13,6 +14,7 @@ export default async function ProjectDetailPage({
 }: ProjectDetailPageProps) {
   const resolvedParams = await params
   const { locale, id } = resolvedParams
+  const tProject = await getTranslations('project')
 
   // Get project by slug
   const project = await getProjectBySlug(id)
@@ -43,7 +45,7 @@ export default async function ProjectDetailPage({
             <span className="material-icons text-base mr-1 group-hover:-translate-x-1 transition-transform">
               arrow_back
             </span>
-            BACK TO PROJECTS
+            {tProject('backToProjects')}
           </a>
         </div>