fix(install): correct Redis URL auth for 1Panel root user

Password must use redis://:pass@ or redis://root:pass@ host; wizard adds
redis_user field defaulting to root on 1Panel Docker installs.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/install.py

@@ -62,6 +62,7 @@ class InitDbRequest(BaseModel):
     redis_host: str = "127.0.0.1"
     redis_port: str = "6379"
     redis_db: str = "0"
+    redis_user: str = ""
     redis_pass: str = ""
     api_port: str = "8600"
     timezone: str = "Asia/Shanghai"
@@ -92,11 +93,17 @@ def _make_db_url(req: InitDbRequest | CreateAdminRequest) -> str:
 
 
 def _build_redis_url(req: InitDbRequest) -> str:
-    url = "redis://"
-    if req.redis_pass:
-        url += f"{quote_plus(req.redis_pass)}@"
-    url += f"{req.redis_host}:{req.redis_port}/{req.redis_db}"
-    return url
+    """Build redis:// URL. Password-only auth must use redis://:pass@host (leading colon)."""
+    user = (req.redis_user or "").strip()
+    password = (req.redis_pass or "").strip()
+    auth = ""
+    if user and password:
+        auth = f"{quote_plus(user)}:{quote_plus(password)}@"
+    elif password:
+        auth = f":{quote_plus(password)}@"
+    elif user:
+        auth = f"{quote_plus(user)}@"
+    return f"redis://{auth}{req.redis_host}:{req.redis_port}/{req.redis_db}"
 
 
 def _read_1panel_hosts_file() -> dict[str, str]:
@@ -236,10 +243,10 @@ def _mysql_connect_error_detail(host: str, port: int) -> str:
 def _redis_auth_error_detail() -> str:
     if os.environ.get("NEXUS_DOCKER_WRITE_ENV") == "1":
         return (
-            "Redis 密码错误或用户被禁用（1Panel Redis 请在步骤 3 填写应用参数中的密码；"
-            "无密码则留空）。主机应为 1Panel-redis-xxxx，不是 127.0.0.1。"
+            "Redis 认证失败。1Panel Redis：用户名填 root，密码填应用参数中的随机密码；"
+            "主机为 1Panel-redis-xxxx（不是 127.0.0.1）。无 ACL 的旧版 Redis 用户名可留空。"
         )
-    return "Redis 密码错误或需要 AUTH；请核对 Redis 密码（无密码则留空）。"
+    return "Redis 密码错误或需要 AUTH；请核对用户名/密码（无密码则留空）。"
 
 
 def _redis_connect_error_detail(host: str, port: int) -> str:
@@ -344,6 +351,7 @@ def _docker_wizard_defaults() -> dict[str, str] | None:
         "redis_host": redis_host,
         "redis_port": "6379",
         "redis_db": "0",
+        "redis_user": "root",
     }