refactor: 去重器改用 API 并修复 tag 唯一性约束处理

- deduplicator: 从直接数据库查询改为调用 /api/webhook/check-duplicates API
- database-ingestor: 使用 JSON 文件传参避免 curl 编码问题
- webhook: 修复 tag name 唯一性约束冲突，更新时删除旧关联重建
- 添加 check-duplicates API 端点用于批量去重检测
- 适配 ProjectTag 显式关联表的数据查询逻辑
- ProjectCard: 修复 getProjectIcon 空值处理

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

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

src/hooks/useProjects.ts

@@ -40,7 +40,11 @@ export async function getProjects(options?: {
     prisma.project.findMany({
       where,
       include: {
-        tags: true,
+        tags: {
+          include: {
+            tag: true,
+          },
+        },
         links: true,
       },
       orderBy: {
@@ -52,8 +56,14 @@ export async function getProjects(options?: {
     prisma.project.count({ where }),
   ])
 
+  // Transform tags to flatten the structure
+  const transformedProjects = projects.map((project) => ({
+    ...project,
+    tags: project.tags.map((pt) => pt.tag),
+  }))
+
   return {
-    projects,
+    projects: transformedProjects,
     pagination: {
       page,
       limit,
@@ -64,13 +74,27 @@ export async function getProjects(options?: {
 }
 
 export async function getProjectBySlug(slug: string) {
-  return prisma.project.findUnique({
+  const project = await prisma.project.findUnique({
     where: { slug },
     include: {
-      tags: true,
+      tags: {
+        include: {
+          tag: true,
+        },
+      },
       links: true,
     },
   })
+
+  if (!project) {
+    return null
+  }
+
+  // Transform tags to flatten the structure
+  return {
+    ...project,
+    tags: project.tags.map((pt) => pt.tag),
+  }
 }
 
 export async function getAllTags() {