fix(models): DeepSeek 写死已下线的 deepseek-chat，客户配完必坏

api.deepseek.com 已停用 deepseek-chat / deepseek-coder / deepseek-reasoner，
现在只接受 deepseek-v4-flash 和 deepseek-v4-pro，用旧名调用直接返回：

  400 The supported API model names are deepseek-v4-pro or
      deepseek-v4-flash, but you passed deepseek-chat.

Config.html 把 card.dataset.model 直接写进 openclaw.json 的 models[].id 和
agents.defaults.model.primary，所以客户只要在配置页点「DeepSeek」卡片，配出来
的就是必然失败的配置——网关照常 listening、webchat 照常连上，只在日志里刷
embedded_run_agent_end/isError=True，界面上表现为「发消息没反应」，极难自诊。

客户机 pc-5376 实测：连续 2 小时、20+ 次对话全部 400 失败。

改动（deepseek-chat -> deepseek-v4-flash）：
- portable/Config.html                     data-model，落盘值
- portable/config-server/public/index.html data-model，落盘值（同一清单第 2 份拷贝）
- install/install.ps1                      交互式选项 1
- install/install.sh                       交互式选项 1 + 未知选项兜底
- u-claw-app/resources/Config.html         已废弃的 Electron 归档，一并改防止复活
- portable/Mac-Menu.command                提示文字
- portable/skills-cn/deepseek-helper/      技能文档模型表（会被 AI 读取并转述给用户）

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

install/install.ps1

@@ -355,9 +355,11 @@ metadata: { "openclaw": { "emoji": "robot" } }
 
 | Model | Use case | Context |
 |-------|----------|---------|
-| deepseek-chat | Daily chat | 32K |
-| deepseek-coder | Code generation | 16K |
-| deepseek-reasoner | Complex reasoning | 64K |
+| deepseek-v4-flash | Daily chat, fast and cheap | 128K |
+| deepseek-v4-pro | Complex reasoning, code | 128K |
+
+> Note: the legacy names `deepseek-chat` / `deepseek-coder` / `deepseek-reasoner` are
+> no longer accepted by api.deepseek.com and return HTTP 400.
 
 - OpenAI-compatible API, base_url: https://api.deepseek.com
 - Direct access in China, API Key: https://platform.deepseek.com
@@ -494,7 +496,7 @@ if ($hasConfig) {
     if ([string]::IsNullOrEmpty($choice)) { $choice = "1" }
 
     $modelConfigs = @{
-        "1"  = @{ model="deepseek-chat"; baseUrl="https://api.deepseek.com/v1"; provider="custom"; label="DeepSeek API Key"; hint="Get key: https://platform.deepseek.com/api_keys"; needKey=$true }
+        "1"  = @{ model="deepseek-v4-flash"; baseUrl="https://api.deepseek.com/v1"; provider="custom"; label="DeepSeek API Key"; hint="Get key: https://platform.deepseek.com/api_keys"; needKey=$true }
         "2"  = @{ model="moonshot-v1-auto"; baseUrl="https://api.moonshot.cn/v1"; provider="custom"; label="Moonshot API Key"; hint="Get key: https://platform.moonshot.cn/console/api-keys"; needKey=$true }
         "3"  = @{ model="qwen-plus"; baseUrl="https://dashscope.aliyuncs.com/compatible-mode/v1"; provider="custom"; label="Qwen API Key"; hint="Get key: https://dashscope.console.aliyun.com/apiKey (free quota available)"; needKey=$true }
         "4"  = @{ model="glm-4-plus"; baseUrl="https://open.bigmodel.cn/api/paas/v4"; provider="custom"; label="Zhipu API Key"; hint="Get key: https://open.bigmodel.cn/usercenter/apikeys"; needKey=$true }