chore(content): round 2 v2 corrections + new solo videos

- 19 (方凌) cover correction: 氛围图3 → 氛围图2
  (original xlsx row was a "12号" typo for 19号 + wrong atmosphere
   number; corrected after teammate review)
- 13 (虞浓) joins CUSTOM_COVERS, will load portraits/013-cover.webp
  (image content = 虞浓_氛围图2)
- Bumped TOS_VERSION 3 → 4 — round-2 TOS uploads include overwrites
  of 006/007/014.mp4 and 019-cover.webp; new browsers/CDN entries.

TOS uploads (handled separately): 013-cover.webp, 019-cover.webp
(overwrite), 006.mp4 (overwrite), 007.mp4 (overwrite), 014.mp4
(overwrite).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/mock-data.ts

@@ -26,6 +26,7 @@ const CUSTOM_COVERS: ReadonlySet<string> = new Set([
   "003",
   "005",
   "012",
+  "013",
   "014",
   "019",
   "025",

src/lib/tos.ts

@@ -14,7 +14,7 @@
  * 立即看到更新后的内容,不必等 TTL 过期或手动 invalidate。
  */
 const TOS_BASE = (process.env.NEXT_PUBLIC_TOS_DOMAIN ?? "").replace(/\/+$/, "");
-const TOS_VERSION = "3";
+const TOS_VERSION = "4";
 
 export function tosUrl(path: string): string {
   const clean = path.replace(/^\/+/, "");