配置全面迁移数据库：PromptConfig、TaskConfig动态调度、敏感词/清洗规则/趋势映射/平台标签/痛点模板全部可编辑

- 新增 PromptConfig 模型 + API，支持提示词在线编辑（16条默认）
- 调度器动态读取 TaskConfig.schedule，admin 可调执行时间
- 新增 KeywordDomainMap、SensitiveWord、ContentCleanRule、TrendFieldMapping 表
- DOMAINS、TREND_DOMAIN_MAP、PLATFORM_TAGS、china_pains、RSS关键词、priority_weights 全部迁移到 DB
- tasks.html 重构：卡片网格+配置/产出/历史/提示词四个Tab，折叠显示
- 清理冗余代码：DEFAULT_PROMPTS死代码、collector.py unreachable代码、compliance_checker bug
- strip_thinking_html 改用 DB 规则优先

platform/frontend/articles.html

@@ -132,7 +132,7 @@
             <template #footer>
                 <div style="display:flex; justify-content:flex-end; gap:8px; width:100%;">
                     <el-button @click="previewVisible = false">关闭</el-button>
-                    <el-button v-if="previewArticleData && previewArticleData.html_content" type="primary" @click="copyPreviewHtml">复制 HTML</el-button>
+                    <el-button v-if="previewArticleData && previewArticleData.html_content" type="primary" @click="copyPreviewHtml">复制正文</el-button>
                 </div>
             </template>
         </el-dialog>
@@ -215,12 +215,18 @@ const ArticlesApp = {
             });
         },
         copyPreviewHtml() {
-            if (!this.previewArticleData || !this.previewArticleData.html_content) {
-                this.$message.warning('暂无 HTML 内容可复制');
-                return;
-            }
-            navigator.clipboard.writeText(this.previewArticleData.html_content)
-                .then(() => this.$message.success('HTML 已复制'))
+            const html = this.previewArticleData?.html_content;
+            if (!html) { this.$message.warning('暂无内容可复制'); return; }
+            const parser = new DOMParser();
+            const doc = parser.parseFromString(html, 'text/html');
+            const titleEl = doc.querySelector('h1');
+            const title = titleEl ? titleEl.textContent.trim() : (this.previewArticleData.topic_title || '');
+            const body = doc.body;
+            if (body) body.querySelectorAll('script, style, svg, img, nav, footer, .interaction').forEach(el => el.remove());
+            const contentEls = body ? Array.from(body.querySelectorAll('p, h1, h2, h3, h4, li')) : [];
+            const text = contentEls.map(el => el.textContent.trim()).filter(t => t && t.length > 1).join('\n\n');
+            navigator.clipboard.writeText(`标题：${title}\n\n内容：\n${text}`)
+                .then(() => this.$message.success('已复制到剪贴板'))
                 .catch(() => this.$message.error('复制失败'));
         },
         async deleteArticle(article) {