docs(readme): replace dated star-count copy in banner with timeless site catchphrases

The previous banner ('Meet Dori. He ships to 56k stars.' + 'The first AI
agent maintainer of a 56k-star repo.') hard-coded the star count into the
image, which dates instantly as the repo grows.

Regenerate the banner to use only the timeless catchphrases that appear on
sisyphuslabs.ai/en:
- Headline: 'Meet Dori. / Not a demo. / Subscribes to everything.'
- Tagline: 'Just tell him what to do.'

Same SISYPHUS LABS wordmark, greek-column motif, @dori chat mockup, and
Merged badge. No star references anywhere in the image.

- Refresh README alt text to match the new banner copy.
- Bump cache-bust query (?v=3 -> ?v=4) so existing readers re-fetch.
- Apply consistently across all five language READMEs (en/ko/ja/ru/zh-cn).

README.ja.md

@@ -11,7 +11,7 @@
 
 > [!NOTE]
 >
-> [![Sisyphus Labs - Meet Dori, the AI agent maintainer of a 56k-star repo.](./.github/assets/sisyphuslabs.png?v=3)](https://sisyphuslabs.ai)
+> [![Sisyphus Labs - Meet Dori. Not a demo. Subscribes to everything.](./.github/assets/sisyphuslabs.png?v=4)](https://sisyphuslabs.ai)
 > > **OmO は上記の Jobdori によってメンテナンスされています。あなた専用の Jobdori、Dori に会いましょう。 <br />[こちら](https://sisyphuslabs.ai) からウェイトリストにご登録ください。**
 
 > [!TIP]

README.ko.md

@@ -10,7 +10,7 @@
 
 > [!NOTE]
 >
-> [![Sisyphus Labs - Meet Dori, the AI agent maintainer of a 56k-star repo.](./.github/assets/sisyphuslabs.png?v=3)](https://sisyphuslabs.ai)
+> [![Sisyphus Labs - Meet Dori. Not a demo. Subscribes to everything.](./.github/assets/sisyphuslabs.png?v=4)](https://sisyphuslabs.ai)
 > > **OmO는 위의 Jobdori에 의해 메인테이닝되고 있습니다. 당신의 Jobdori, Dori를 만나세요. <br />대기 명단은 [여기](https://sisyphuslabs.ai)에서 받습니다.**
 
 > [!TIP]

README.md

@@ -10,7 +10,7 @@
 
 > [!NOTE]
 >
-> [![Sisyphus Labs - Meet Dori, the AI agent maintainer of a 56k-star repo.](./.github/assets/sisyphuslabs.png?v=3)](https://sisyphuslabs.ai)
+> [![Sisyphus Labs - Meet Dori. Not a demo. Subscribes to everything.](./.github/assets/sisyphuslabs.png?v=4)](https://sisyphuslabs.ai)
 > > **OmO is maintained by Jobdori, the AI assistant shown above. Meet your own Jobdori — Dori. <br />Join the waitlist [here](https://sisyphuslabs.ai).**
 
 > [!TIP]

README.ru.md

@@ -11,7 +11,7 @@
 
 > [!NOTE]
 >
-> [![Sisyphus Labs - Meet Dori, the AI agent maintainer of a 56k-star repo.](./.github/assets/sisyphuslabs.png?v=3)](https://sisyphuslabs.ai)
+> [![Sisyphus Labs - Meet Dori. Not a demo. Subscribes to everything.](./.github/assets/sisyphuslabs.png?v=4)](https://sisyphuslabs.ai)
 >
 > > **OmO поддерживается Jobdori — ИИ-ассистентом, показанным выше. Познакомьтесь со своим Jobdori — Dori. <br />Присоединяйтесь к листу ожидания [здесь](https://sisyphuslabs.ai).**
 

README.zh-cn.md

@@ -11,7 +11,7 @@
 
 > [!NOTE]
 >
-> [![Sisyphus Labs - Meet Dori, the AI agent maintainer of a 56k-star repo.](./.github/assets/sisyphuslabs.png?v=3)](https://sisyphuslabs.ai)
+> [![Sisyphus Labs - Meet Dori. Not a demo. Subscribes to everything.](./.github/assets/sisyphuslabs.png?v=4)](https://sisyphuslabs.ai)
 > > **OmO 由上述的 Jobdori 进行维护。认识你专属的 Jobdori — Dori。<br />[在此处](https://sisyphuslabs.ai)加入等待名单。**
 
 > [!TIP]