feat(auth): add legacy password login failure message and FAQ guidance for upgrade issues

astrbot/dashboard/routes/auth.py

@@ -38,6 +38,13 @@ DEFAULT_PASSWORD_LOGIN_FAILURE_MESSAGE = (
     "随机强密码。请使用日志中提供的的初始密码来登录。了解更多："
     "https://docs.astrbot.app/faq.html"
 )
+LEGACY_PASSWORD_LOGIN_FAILURE_MESSAGE = (
+    "Incorrect username or password. If you cannot log in after upgrading "
+    "AstrBot even though the password is correct, see "
+    "https://docs.astrbot.app/en/faq.html\n\n"
+    "用户名或密码错误。如果你在升级 AstrBot 后遇到了密码正确但无法登录的情况，"
+    "请参考 https://docs.astrbot.app/faq.html"
+)
 
 
 class AuthRoute(Route):
@@ -181,6 +188,8 @@ class AuthRoute(Route):
         await asyncio.sleep(3)
         if req_password == "astrbot":
             return Response().error(DEFAULT_PASSWORD_LOGIN_FAILURE_MESSAGE).__dict__
+        if is_legacy_dashboard_password(password):
+            return Response().error(LEGACY_PASSWORD_LOGIN_FAILURE_MESSAGE).__dict__
         return Response().error("用户名或密码错误").__dict__
 
     async def logout(self):

docs/en/faq.md

@@ -70,6 +70,18 @@ The segment should look like:
 
 After restart, AstrBot will automatically generate a random password with the fixed username `astrbot`; check the startup logs.
 
+### Correct Password Cannot Log In After Upgrading AstrBot
+
+If you are sure the dashboard password is correct but still cannot log in after upgrading AstrBot, the old WebUI static files may be incompatible with the newer backend.
+
+Solution:
+
+1. Stop AstrBot.
+2. Delete the `dist` folder under AstrBot's `data` directory: `AstrBot/data/dist`.
+3. Restart AstrBot.
+
+After restart, AstrBot will reload or download WebUI files that match the current version.
+
 ## Bot Core Related
 
 ### How to Let AstrBot Control My Mac / Windows / Linux Computer?

docs/zh/faq.md

@@ -71,6 +71,18 @@ Set dashboard.host in data/cmd_config.json to enable remote access.
 
 重启后 AstrBot 将会自动生成随机的密码以及固定的用户名 `astrbot`，请在日志查看。
 
+### 升级 AstrBot 后密码正确但无法登录
+
+如果你确认管理面板密码正确，但升级 AstrBot 后仍然无法登录，可能是旧版 WebUI 静态文件缓存与新版后端不兼容。
+
+解决方案：
+
+1. 停止 AstrBot。
+2. 删除 AstrBot 的 `data` 目录下的 `dist` 文件夹，即 `AstrBot/data/dist`。
+3. 重新启动 AstrBot。
+
+重启后，AstrBot 会重新加载或下载匹配当前版本的 WebUI 文件。
+
 ## AstrBot 使用相关
 
 ### 如何让 AstrBot 控制我的 Mac / Windows / Linux 电脑？

tests/test_dashboard.py

@@ -413,6 +413,48 @@ async def test_legacy_md5_dashboard_password_keeps_legacy_auth_until_edit(
         )
 
 
+@pytest.mark.asyncio
+async def test_legacy_md5_login_failure_includes_upgrade_faq_hint(
+    app: Quart,
+    core_lifecycle_td: AstrBotCoreLifecycle,
+):
+    original_dashboard_config = copy.deepcopy(
+        core_lifecycle_td.astrbot_config["dashboard"]
+    )
+    test_client = app.test_client()
+    legacy_password = "AstrbotLegacy123"
+
+    try:
+        core_lifecycle_td.astrbot_config["dashboard"]["username"] = "astrbot"
+        core_lifecycle_td.astrbot_config["dashboard"]["password"] = (
+            hash_legacy_dashboard_password(legacy_password)
+        )
+        core_lifecycle_td.astrbot_config["dashboard"]["pbkdf2_password"] = ""
+        await _set_dashboard_password_change_required(core_lifecycle_td, False)
+        await set_password_storage_upgraded(
+            core_lifecycle_td.db,
+            core_lifecycle_td.astrbot_config,
+            False,
+        )
+
+        response = await test_client.post(
+            "/api/auth/login",
+            json={"username": "astrbot", "password": "WrongPassword123"},
+        )
+        data = await response.get_json()
+
+        assert data["status"] == "error"
+        assert data["message"].startswith("Incorrect username or password.")
+        assert "用户名或密码错误" in data["message"]
+        assert "https://docs.astrbot.app/en/faq.html" in data["message"]
+        assert "https://docs.astrbot.app/faq.html" in data["message"]
+    finally:
+        await _restore_dashboard_password_state(
+            core_lifecycle_td,
+            original_dashboard_config,
+        )
+
+
 @pytest.mark.asyncio
 async def test_password_storage_flag_repairs_after_rollback_clears_pbkdf2(
     app: Quart,