feat: resolve trial-only playback via trialDuration/effectiveDuration

VIP songs for non-VIP accounts return a ~30s trial fragment. The player used the full duration for isNearEnd, so the trial end didn't trigger auto-advance (~60s stall), and currentSong.duration stayed full, leaving the UI progress stuck.

- provider.ts: SongUrlResult {url, trialDuration?}; getSongUrl signature
- netease.ts: parseNeteaseTrial (freeTrialInfo start/end in seconds) + getSongUrl
- qq.ts: parseQqTrial (isTryout/tryEnd) + getSongUrl
- bilibili/youtube: getSongUrl returns {url}
- instance.ts: resolveAndPlay uses effectiveDuration = trialDuration ?? duration -> nearEnd at trial end -> native auto-advance; BotStatus.effectiveDuration
- VIP account: freeTrialInfo absent -> full duration -> full playback (no toggle)

Backward compatible (optional fields; getSongUrl has a single caller, updated).
Tests: parseTrial assertions (seconds/alias/ms-fallback). 14 pass.

src/music/qq.ts

@@ -2,6 +2,7 @@ import axios, { type AxiosInstance } from "axios";
 import type {
   MusicProvider,
   Song,
+  SongUrlResult,
   Playlist,
   PlaylistDetail,
   LyricLine,
@@ -58,6 +59,18 @@ export function mapQqSongs(raw: any[] | null | undefined): Song[] {
   }).filter((s) => s.id);
 }
 
+/** 解析 QQ 试听标记 → 试听秒数；非试听（VIP/免费）返回 undefined。
+ *  字段 isTryout===1 / tryout===true + tryBegin/tryEnd；容忍 begin/start 别名 + 毫秒兜底。 */
+export function parseQqTrial(playUrl: any): number | undefined {
+  if (!playUrl || typeof playUrl !== "object") return undefined;
+  if (playUrl.isTryout !== 1 && playUrl.tryout !== true) return undefined;
+  const begin = Number(playUrl.tryBegin ?? playUrl.begin ?? playUrl.start ?? 0);
+  const end = Number(playUrl.tryEnd ?? playUrl.end);
+  if (!Number.isFinite(end) || end <= begin) return undefined;
+  const secs = end > 1000 ? (end - begin) / 1000 : end - begin;
+  return Math.round(secs);
+}
+
 export function mapQqAlbums(raw: any[] | null | undefined): Album[] {
   if (!Array.isArray(raw)) return [];
   return raw.map((a) => {
@@ -248,13 +261,13 @@ export class QQMusicProvider implements MusicProvider {
     return { songs, playlists: [], albums };
   }
 
-  async getSongUrl(songId: string, quality?: string): Promise<string | null> {
+  async getSongUrl(songId: string, quality?: string): Promise<SongUrlResult | null> {
     try {
       const res = await this.api.get("/getMusicPlay", {
         params: { songmid: songId, quality: quality ?? this.quality, ...this.cookieParams },
       });
       const playUrl = res.data?.data?.playUrl?.[songId];
-      if (playUrl?.url) return playUrl.url;
+      if (playUrl?.url) return { url: playUrl.url, trialDuration: parseQqTrial(playUrl) };
     } catch {
       // try with songid
       try {
@@ -262,7 +275,7 @@ export class QQMusicProvider implements MusicProvider {
           params: { songid: songId, quality: quality ?? this.quality, ...this.cookieParams },
         });
         const playUrl = res.data?.data?.playUrl?.[songId];
-        if (playUrl?.url) return playUrl.url;
+        if (playUrl?.url) return { url: playUrl.url, trialDuration: parseQqTrial(playUrl) };
       } catch {
         // ignore
       }