fix: 9 bugs from code review

Critical:
- build script now copies launcher menu + china guide (was missing!)
- Windows PATH: handle fresh accounts + warn on 1024 char limit
- Windows .bat: remove old .env keys before adding new (no duplicates)

Important:
- Menu error message: fix range 0-14 → 0-16
- API key input: use read -s to hide plaintext
- macOS install: default to .zshrc (not .bash_profile)
- Website table: fix column mismatch (td → span inside td)

website/index.html

@@ -500,43 +500,43 @@
             <tr>
                 <td><strong>DeepSeek</strong></td>
                 <td>深度求索</td>
-                <td class="zh">编程，性价比之王</td><td class="en hidden">Coding, best value</td>
+                <td><span class="zh">编程，性价比之王</span><span class="en hidden">Coding, best value</span></td>
                 <td><span class="badge badge-hot">★ 推荐</span></td>
             </tr>
             <tr>
                 <td><strong>Kimi K2.5</strong></td>
                 <td>月之暗面</td>
-                <td class="zh">256K 超长上下文</td><td class="en hidden">256K context</td>
+                <td><span class="zh">256K 超长上下文</span><span class="en hidden">256K context</span></td>
                 <td><span class="badge badge-cheap">长文档</span></td>
             </tr>
             <tr>
                 <td><strong>Qwen</strong></td>
                 <td>阿里通义千问</td>
-                <td class="zh">免费额度最大</td><td class="en hidden">Large free tier</td>
+                <td><span class="zh">免费额度最大</span><span class="en hidden">Large free tier</span></td>
                 <td><span class="badge badge-free">免费</span></td>
             </tr>
             <tr>
                 <td><strong>GLM 4.7</strong></td>
                 <td>智谱 AI</td>
-                <td class="zh">学术，中文 NLP</td><td class="en hidden">Academic</td>
+                <td><span class="zh">学术，中文 NLP</span><span class="en hidden">Academic</span></td>
                 <td></td>
             </tr>
             <tr>
                 <td><strong>MiniMax</strong></td>
                 <td>MiniMax</td>
-                <td class="zh">语音，多模态</td><td class="en hidden">Voice, multimodal</td>
+                <td><span class="zh">语音，多模态</span><span class="en hidden">Voice, multimodal</span></td>
                 <td></td>
             </tr>
             <tr>
                 <td><strong>Doubao</strong></td>
                 <td>字节豆包</td>
-                <td class="zh">火山引擎生态</td><td class="en hidden">ByteDance ecosystem</td>
+                <td><span class="zh">火山引擎生态</span><span class="en hidden">ByteDance ecosystem</span></td>
                 <td></td>
             </tr>
             <tr>
                 <td><strong>Claude</strong></td>
                 <td>Anthropic</td>
-                <td class="zh">最强综合能力</td><td class="en hidden">Best overall</td>
+                <td><span class="zh">最强综合能力</span><span class="en hidden">Best overall</span></td>
                 <td><span class="badge badge-hot">Global</span></td>
             </tr>
         </tbody>