feat(ai): 打通 SEO 闭环与投稿写作辅助

对齐 Zibll 的 AI 生成 SEO 流程：统一 WP AI Client/主题 Provider 双后端、文章/分类 SEO 框与生成回填、投稿摘要/标签建议，并收敛扩展页为连接配置。

assets/js/admin-ai-seo.js

@@ -0,0 +1,130 @@
+/**
+ * AKSRT Admin AI SEO — generate button for post/term SEO fields
+ */
+(function () {
+  'use strict';
+
+  if (!window.aksrtAiSeo) return;
+
+  var CFG = window.aksrtAiSeo;
+  var REST = (CFG.restUrl || '/wp-json/aksrt/v1').replace(/\/$/, '');
+  var NONCE = CFG.nonce || '';
+  var I18N = CFG.i18n || {};
+
+  function notify($btn, msg, type) {
+    var wrap = $btn.closest('.aksrt-seo-meta-box, td, .form-field, p') || $btn.parentNode;
+    if (!wrap) return;
+    var old = wrap.querySelector('.aksrt-ai-seo-msg');
+    if (old) old.remove();
+    var el = document.createElement('span');
+    el.className = 'aksrt-ai-seo-msg ' + (type === 'error' ? 'is-error' : 'is-ok');
+    el.textContent = msg;
+    wrap.appendChild(el);
+    setTimeout(function () {
+      if (el.parentNode) el.parentNode.removeChild(el);
+    }, 8000);
+  }
+
+  function fillPost(data) {
+    var map = {
+      title: 'aksrt_seo_title',
+      keywords: 'aksrt_seo_keywords',
+      description: 'aksrt_seo_description',
+    };
+    Object.keys(map).forEach(function (key) {
+      var field = data[key] || {};
+      if (!field.content) return;
+      var input = document.getElementById(map[key]) || document.querySelector('[name="' + map[key] + '"]');
+      if (input) input.value = field.content;
+    });
+  }
+
+  function fillTerm(data) {
+    var map = {
+      title: '.aksrt-term-seo-title, #aksrt_seo_title',
+      keywords: '.aksrt-term-seo-keywords, #aksrt_seo_keywords',
+      description: '.aksrt-term-seo-description, #aksrt_seo_description',
+    };
+    Object.keys(map).forEach(function (key) {
+      var field = data[key] || {};
+      if (!field.content) return;
+      var input = document.querySelector(map[key]);
+      if (input) input.value = field.content;
+    });
+  }
+
+  function collectErrors(data) {
+    var errors = [];
+    ['title', 'keywords', 'description'].forEach(function (key) {
+      if (data[key] && data[key].error) errors.push(data[key].error);
+    });
+    return errors;
+  }
+
+  document.addEventListener('click', function (e) {
+    var btn = e.target.closest('.aksrt-ai-seo-generate');
+    if (!btn) return;
+    e.preventDefault();
+
+    if (btn.classList.contains('is-loading') || btn.disabled) return;
+
+    var type = btn.getAttribute('data-type') || 'post';
+    var id = parseInt(btn.getAttribute('data-id') || '0', 10);
+    if (!id) {
+      notify(btn, I18N.needSave || '请先保存后再生成 SEO', 'error');
+      return;
+    }
+    if (CFG.ai && CFG.ai.available === false) {
+      notify(btn, I18N.notAvailable || 'AI 未配置或未启用', 'error');
+      return;
+    }
+
+    var original = btn.textContent;
+    btn.classList.add('is-loading');
+    btn.textContent = I18N.generating || '生成中…';
+
+    fetch(REST + '/ai/seo-generate', {
+      method: 'POST',
+      credentials: 'same-origin',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-WP-Nonce': NONCE,
+      },
+      body: JSON.stringify({ type: type, id: id }),
+    })
+      .then(function (r) {
+        return r.json().then(function (json) {
+          return { ok: r.ok, json: json };
+        });
+      })
+      .then(function (res) {
+        btn.classList.remove('is-loading');
+        btn.textContent = original;
+
+        if (!res.ok || !res.json || res.json.success === false) {
+          var msg =
+            (res.json && (res.json.message || (res.json.data && res.json.data.message))) ||
+            I18N.failed ||
+            '生成失败';
+          notify(btn, msg, 'error');
+          return;
+        }
+
+        var data = res.json.data || {};
+        if (type === 'term') fillTerm(data);
+        else fillPost(data);
+
+        var errors = collectErrors(data);
+        if (errors.length) {
+          notify(btn, errors.join('；'), 'error');
+        } else {
+          notify(btn, I18N.success || '已填入 SEO 字段，请检查后更新保存', 'ok');
+        }
+      })
+      .catch(function () {
+        btn.classList.remove('is-loading');
+        btn.textContent = original;
+        notify(btn, I18N.failed || '生成失败', 'error');
+      });
+  });
+})();