feat: 在账号资源库中展示导入的标签字段

KOC 资源导入模板新增「标签」列，导入后写入 accounts.tags 并在
账号资源库面板以 badge 形式展示，导出时也带回标签列以保证往返一致。

- lib/resource-import.ts: 新增 tags 字段与 HEADER 别名（标签/账号标签/人设标签），
  新增 normalizeTags/mergeTags 工具，按顿号规整与合并
- 修复 xlsx 解析器对自闭合空 cell (<c r="G6"/>) 的错位 bug，否则
  行内出现空 cell 会让后续 cell 的列引用读到错误 body（如老茄子行标签丢失）
- db/schema.ts + lib/mvp-db.ts: accounts 表新增 tags VARCHAR(500)
- app/api/resources-import/route.ts: SELECT/INSERT/UPDATE/预览全部带上 tags
- app/api/resources-export/route.ts: 导出表加「标签」列
- app/admin-app.tsx + app/globals.css: 资源卡片新增「账号标签」区，
  导入预览行展示标签
- public/KOC资源导入模板.xlsx: 模板补「标签（选填）」列与填写说明
- mysql/0005_account_tags.sql: 线上 MySQL 迁移
- tests/resource-import.test.mjs: 补 tags 解析/合并用例

app/admin-app.tsx

@@ -60,6 +60,7 @@ type Account = {
   post_count: number;
   avg_views: number;
   cooperation_source: string;
+  tags: string;
   first_seen_at: string;
   last_seen_at: string;
 };
@@ -74,6 +75,7 @@ type ResourceImportPreview = {
     ipLocation: string;
     followers: number;
     cooperationSource: string;
+    tags: string;
     action: "create" | "update" | "error";
     errors: string[];
   }>;
@@ -1991,6 +1993,14 @@ function ResourcesPage({
             ].filter(Boolean),
           ),
         ].sort((left, right) => left.localeCompare(right, "zh-CN")),
+        tags: [
+          ...new Set(
+            (account.tags || "")
+              .split(/[、,，;；|]/)
+              .map((item) => item.trim())
+              .filter(Boolean),
+          ),
+        ],
         partnerManagedOnly:
           deliveries.some((item) => item.delegation_bundle_id) &&
           deliveries.every((item) => item.delegation_bundle_id),
@@ -2203,7 +2213,7 @@ function ResourcesPage({
           </div>
         </div>
         <div className="resource-grid">
-          {filteredAccounts.map(({ account, sources, partnerManagedOnly }) => (
+          {filteredAccounts.map(({ account, sources, tags: tagList, partnerManagedOnly }) => (
             <article className="resource-card" key={account.id}>
               <div className="resource-card-head">
                 <div className={`avatar xlarge ${avatarColor(account.nickname)}`}>{account.nickname.slice(0, 1)}</div>
@@ -2227,6 +2237,14 @@ function ResourcesPage({
                   )}
                 </div>
               </div>
+              {tagList.length > 0 && (
+                <div className="resource-tags">
+                  <span>账号标签</span>
+                  <div>
+                    {tagList.map((tag) => <b key={tag}>{tag}</b>)}
+                  </div>
+                </div>
+              )}
               <div className="resource-card-foot">
                 <span>最近合作 {formatDate(account.last_seen_at)}</span>
                 {account.profile_url && <a href={account.profile_url} target="_blank" rel="noreferrer">查看主页 ↗</a>}
@@ -2282,7 +2300,7 @@ function ResourcesPage({
             </label>
             {!importPreview && (
               <div className="import-template-note">
-                <div><strong>还没有模板？</strong><span>只有账号链接必填；已有昵称、账号ID、IP属地、粉丝数和合作来源可直接填写，系统只补全空缺字段。</span></div>
+                <div><strong>还没有模板？</strong><span>只有账号链接必填；已有昵称、账号ID、IP属地、粉丝数、合作来源和标签可直接填写，系统只补全空缺字段。</span></div>
                 <a className="ghost-button" download href="/KOC资源导入模板.xlsx">下载模板</a>
               </div>
             )}
@@ -2303,7 +2321,7 @@ function ResourcesPage({
                       <span>{row.rowNumber}</span>
                       <span><strong>{row.nickname || "—"}</strong><small>{row.platform || "未填写平台"}</small></span>
                       <span>{row.publicAccountId || "主页识别"}</span>
-                      <span><strong>{row.ipLocation}</strong><small>{row.cooperationSource || "未填写来源"}</small></span>
+                      <span><strong>{row.ipLocation}</strong><small>{row.cooperationSource || "未填写来源"}</small>{row.tags && <em>{row.tags}</em>}</span>
                       <span className={`import-result ${row.action}`}>
                         {row.action === "create" ? "新增" : row.action === "update" ? "更新" : row.errors.join("；")}
                       </span>