feat: 播放页按来源列表切换，新增作者/搜索/hashtag 侧栏

- 播放上下文：作品链接带上来源（搜索、标签、作者、hashtag），上一条/下一条
  在该列表内移动；当前作品不在列表中时退回全部作品的发布时间顺序
- 顶部提示标签显示当前列表与位置，点击打开侧栏列表，✕ 退出
- 侧栏改为「评论 | TA的作品 | 搜索结果/#hashtag」标签页，作品封面网格可就地切换
- 作者模式：打开「TA的作品」进入，关闭侧栏不退出，点提示 ✕ 后回到原来的列表
- 从搜索结果进入或点 hashtag 时自动打开对应列表
- 描述中的 hashtag 可点击，按完整 hashtag 精确匹配（#丰川祥子 不含 #丰川祥子cos）
- 新增 /api/playlist；搜索 SQL 抽到 lib/search-query.ts 与播放页共用，保证顺序一致
- 移动端：底部抽屉、点作品后收起，媒体区支持上下滑切换

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/search/route.ts

@@ -2,26 +2,10 @@ import { NextResponse } from "next/server";
 import { json } from "@/lib/json";
 import { getFileUrl } from "@/lib/minio";
 import { prisma } from "@/lib/prisma";
-import {
-  buildSnippet,
-  highlightAll,
-  parseSearchQuery,
-  termToPgPattern,
-} from "@/lib/search";
+import { buildSnippet, highlightAll, parseSearchQuery } from "@/lib/search";
+import { searchRows } from "@/lib/search-query";
 import { isVideoContentTag } from "@/lib/video-tags";
 
-type SearchRow = {
-  awemeId: string;
-  type: "video" | "image";
-  score: number;
-  inDesc: boolean;
-  inTranscript: boolean;
-  rawDesc: string;
-  rawTranscript: string;
-  contentTags: string[];
-  total: number;
-};
-
 export async function GET(req: Request) {
   const { searchParams } = new URL(req.url);
   const q = (searchParams.get("q") || "").trim();
@@ -43,79 +27,12 @@ export async function GET(req: Request) {
     return json({ results: [], total: 0, page, limit, terms });
   }
 
-  // 关键词已在 parseSearchQuery 里转为小写，这里转成正则后与 lower() 后的文本匹配
-  const patterns = terms.map(termToPgPattern);
-  const excludePatterns = excludes.map(termToPgPattern);
-
   try {
-    // 子串匹配：每个关键词都必须出现在「描述 + 语音转写」里（不区分大小写），
-    // 不依赖分词，所以输入任意片段都能搜到。数据量小，全表扫描足够快。
-    // 打分：描述命中权重更高，按出现次数累加（设上限防止长转写刷分）；同分按发布时间倒序。
-    // 没有关键词、只按标签筛选时，score 都是 0，等价于按时间排序。
-    const rows = await prisma.$queryRaw<SearchRow[]>`
-      WITH params AS (
-        SELECT ${patterns}::text[] AS terms, ${excludePatterns}::text[] AS excludes
-      ),
-      docs AS (
-        SELECT
-          v.aweme_id AS "awemeId",
-          'video'::text AS type,
-          v."desc" AS "rawDesc",
-          COALESCE(array_to_string(vt.transcript, E'\n'), '') AS "rawTranscript",
-          v.created_at AS created,
-          v.manual_content_tags AS "contentTags"
-        FROM "Video" v
-        LEFT JOIN "VideoTranscript" vt ON vt."videoId" = v.aweme_id
-        WHERE ${contentTag}::text IS NULL
-           OR v.manual_content_tags @> ARRAY[${contentTag}]::text[]
-
-        UNION ALL
-
-        SELECT
-          ip.aweme_id,
-          'image'::text,
-          ip."desc",
-          '',
-          ip.created_at,
-          ARRAY[]::text[]
-        FROM "ImagePost" ip
-        WHERE ${contentTag}::text IS NULL
-      ),
-      lowered AS (
-        SELECT docs.*, lower(docs."rawDesc") AS d, lower(docs."rawTranscript") AS t
-        FROM docs
-      ),
-      matched AS (
-        SELECT
-          l.*,
-          COALESCE((
-            SELECT SUM(
-              4 * LEAST(regexp_count(l.d, term), 3)
-              + LEAST(regexp_count(l.t, term), 10)
-            )
-            FROM unnest(p.terms) term
-          ), 0)::float8 AS score,
-          EXISTS (SELECT 1 FROM unnest(p.terms) term WHERE l.d ~ term) AS "inDesc",
-          EXISTS (SELECT 1 FROM unnest(p.terms) term WHERE l.t ~ term) AS "inTranscript"
-        FROM lowered l, params p
-        WHERE NOT EXISTS (
-            SELECT 1 FROM unnest(p.terms) term
-            WHERE l.d !~ term AND l.t !~ term
-          )
-          AND NOT EXISTS (
-            SELECT 1 FROM unnest(p.excludes) x
-            WHERE l.d ~ x OR l.t ~ x
-          )
-      )
-      SELECT
-        "awemeId", type, score, "inDesc", "inTranscript",
-        "rawDesc", "rawTranscript", "contentTags",
-        (COUNT(*) OVER ())::int AS total
-      FROM matched
-      ORDER BY score DESC, created DESC, "awemeId"
-      OFFSET ${offset}
-      LIMIT ${limit};
-    `;
+    const rows = await searchRows(
+      { terms, excludes, contentTag },
+      offset,
+      limit,
+    );
 
     const videoIds = rows
       .filter((r) => r.type === "video")