feat: Phase 0 技术性 SEO+GEO

- 新增 robots.txt（显式欢迎 AI 爬虫）/ sitemap.xml / llms.txt
- head：TKD 重写（关键词式 title）、canonical、og:url/og:locale、og:image 改绝对地址
- JSON-LD：Organization + 8 产品 + FAQPage 三组
- 新增 FAQ 区块（原生 details 手风琴，零 JS）+ i18n 13 键
- 8 产品图 alt 补型号关键词；双语言 document.title 同步
- CI：两条流水线 tar 清单补入三个根文件

assets/css/style.css

@@ -583,6 +583,36 @@ html[lang="en"] .tags span { font-size: 11px; }
 .footer-brand span { font-size: 14px; color: var(--muted); }
 .footer-copy { font-size: 13px; color: var(--muted); }
 
+/* ============================================================
+   FAQ 手风琴（原生 details/summary，零 JS；描边手法复用 .card）
+   ============================================================ */
+.faq-list { display: grid; gap: 12px; max-width: 860px; margin: 0 auto; }
+.faq-item {
+  border-radius: 14px;
+  background:
+    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
+    linear-gradient(140deg, rgba(76, 195, 255, 0.28), rgba(148, 178, 255, 0.06) 40%, rgba(255, 61, 90, 0.24)) border-box;
+  border: 1px solid transparent;
+  padding: 16px 22px;
+}
+.faq-item summary {
+  cursor: pointer;
+  font-weight: 600;
+  font-size: 15px;
+  list-style: none;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 12px;
+  color: var(--text);
+}
+.faq-item summary::-webkit-details-marker { display: none; }
+/* 用 + 号旋转做展开指示，免图标资源 */
+.faq-item summary::after { content: '+'; color: var(--muted); font-size: 18px; transition: transform 0.2s; }
+.faq-item[open] summary::after { transform: rotate(45deg); }
+.faq-item p { margin-top: 12px; font-size: 14px; line-height: 1.8; color: var(--muted); }
+
+
 /* ============================================================
    滚动淡入
    ============================================================ */

assets/js/main.js

@@ -96,6 +96,20 @@
     'contact.sub': 'Scan the QR code, or email us about your digital upgrade needs.',
     'contact.company': 'Suzhou Shashann Technology Co., Ltd.',
     'contact.loc': 'R&D & Production Bases: Nanjing · Zhangjiagang · Changzhou',
+    // 常见问题
+    'faq.title': 'FAQ',
+    'faq.q1': 'What is a smart collar?',
+    'faq.a1': 'A smart collar is an IoT device worn around the neck of cattle, sheep and other livestock, combining positioning, vitals monitoring and geofence alarms for data-driven grazing. Shashann SG03 is solar-powered with voice calling, smart find, satellite comms and music playback; SG03 mini goes long battery + wireless charging.',
+    'faq.q2': 'Ear tag or smart collar — which should I choose?',
+    'faq.a2': 'Ear tags answer "many animals, cost-sensitive" tracking: ST01 supports mesh networking, loss alarms and LED find. Collars answer "deep management of key animals": positioning, vitals monitoring and voice calling. For open-range grazing, combine ear tags with the BG01 base station, and add collars for breeding stock and high-value animals.',
+    'faq.q3': 'What is the difference between UWB tags and Bluetooth tags?',
+    'faq.a3': 'The UWB tag SL01 delivers centimeter-level positioning with fall detection and helmet mounting — for construction sites and precision tracking. The Bluetooth tag ST02 focuses on LED find and buzzer alarms at ultra-low power and low cost — for everyday asset loss prevention. Choose UWB when you need exact positions, Bluetooth when you just need to find things.',
+    'faq.q4': 'Is the smart hydroponic grow rack for homes or schools?',
+    'faq.a4': 'Both. HS01 is a standalone cabinet design that is easy to expand, supporting both unattended AI mode and manual control: families use AI mode to grow food at home, while school labor courses use manual mode so students take part in the whole process.',
+    'faq.q5': 'What is a digital-twin beam yard system?',
+    'faq.a5': 'A digital-twin beam yard system maps production, materials, resettlement and bridge management of precast beam yards into computable digital models. Shashann delivers it as a complete package: SaaS platform + WeChat mini program + multi-sensor data access.',
+    'faq.q6': 'What software platforms come with Shashann hardware?',
+    'faq.a6': 'Every hardware line ships with a companion SaaS platform and APP/WeChat mini program, with device data flowing straight to the cloud: Smart Grazing System (multi-account ranch management, geofence alarms, full lifecycle traceability), Smart Hydroponics System (auto planting adjustment, AI assistant) and Smart Asset Management System (real-time state computation, predictive maintenance).',
     // Footer
     'footer.slogan': 'Powering digital transformation with AIoT',
     'footer.name': 'Suzhou Shashann Technology Co., Ltd.',
@@ -131,8 +145,8 @@
     });
     document.getElementById('langToggle').textContent = l === 'zh' ? 'EN' : '中文';
     document.title = l === 'zh'
-      ? '苏州沙香科技有限公司 — AIoT 智能硬件与数字化平台'
-      : 'Suzhou Shashann Technology — AIoT Smart Hardware & Digital Platforms';
+      ? '智能项圈_智能水培种植架_UWB定位标签_数字孪生定制 - 苏州沙香科技'
+      : 'Smart Collar_Hydroponic Grow Rack_UWB Tag_Digital Twin - Suzhou Shashann';
   }
 
   document.getElementById('langToggle').addEventListener('click', function () {