docs: clarify first self-hosted login

Add first-login FAQ and activation notes for self-hosted Docker deployments.

Author: HynLcc

en/deploy/activate.mdx

@@ -40,6 +40,10 @@ After successfully installing Teable:
 2. Navigate to the **Admin Panel**
 3. You can access the Admin Panel from the user menu
 
+<Note>
+If this is your first time opening the instance, sign up on the instance URL first. Teable does not provide a default administrator account; the first registered user becomes the instance administrator.
+</Note>
+
 <img
   src="/images/selfhosted/activate/2026-05-29-activate-admin-panel.png"
   alt="Admin Panel entry"

en/deploy/docker.mdx

@@ -401,6 +401,12 @@ If you only need the open-source Community feature set, you can choose the `ghcr
 
 ## Common Issues
 
+<Accordion title="How do I log in after the first deployment?">
+After the instance starts, open your instance URL and create an account there. Teable does not ship with a preset administrator account, and your self-hosted instance does not use your teable.ai cloud account.
+
+The first user who signs up on the instance becomes the instance administrator.
+</Accordion>
+
 <Accordion title="Why can't I import CSV/xlsx or upload images after installation">
 File import issues are typically due to incorrect configuration of the PUBLIC_ORIGIN environment variable. You need to set PUBLIC_ORIGIN to the currently accessible address:
 ```bash

zh/deploy/activate.mdx

@@ -40,6 +40,10 @@ Teable 为自托管部署提供了不同的订阅计划，每个计划都有其
 2. 进入 **管理员后台（Admin Panel）**
 3. 您可以从用户菜单中访问管理员后台
 
+<Note>
+如果这是您第一次打开该实例，请先在实例访问地址上注册账号。Teable 不提供默认管理员账号，第一个注册用户会自动成为实例管理员。
+</Note>
+
 <img
   src="/images/selfhosted/activate/2026-05-29-activate-admin-panel.png"
   alt="管理面板入口"

zh/deploy/docker.mdx

@@ -466,6 +466,12 @@ Teable 社区版本在 AGPL-3.0 协议下开源。企业版本请[联系我们](
 
 ## 常见问题
 
+<Accordion title="首次部署后如何登录？">
+实例启动后，打开您的实例访问地址，并在该实例上注册一个账号。Teable 不提供预设管理员账号，您的自托管实例也不会使用 teable.ai 云端账号登录。
+
+在该实例上第一个注册的用户会自动成为实例管理员。
+</Accordion>
+
 <Accordion title="为什么我安装过后无法导入文件/无法上传图片">
 无法导入文件通常是因为没有正确配置PUBLIC_ORIGIN环境变量。您需要将PUBLIC_ORIGIN设置为当前可访问的地址：
 ```bash