feat: 养护模板/社区运营/体重趋势/计划日历 + 雪花ID重构 + 文件表与图片上传

后端
- 主键改雪花字符串 ID（pkg/idgen + Base.BeforeCreate），全表外键/JWT/中间件随之调整
- 新增 files 表：/api/upload 按 MD5 去重，返回 {id,url,md5}，服务端只收图片
- 头像/记录附图/帖子图改 file_id 关联，读取解析为 URL
- 养护模板（物种×阶段）后台可配 + AI 生成草稿；建档按模板生成任务/计划/提醒
- 社区 AI 运营：虚拟账号池 + 每日定时/手动生成，帖子带 AI 标
- 计划路线图节点带真实日期；首页周历与计划日历同源；新增 day-plan 当日安排
- 体重趋势接口带备注；记录列表分页

小程序
- 公共图片上传 utils/upload.js（仅图片）；记录拍照/我的头像/社区发图三处接入
- 首页日历点选查当日任务；记录页体重趋势可点看备注 + 时间轴分页折叠
- 计划页日历点选查当日计划；自定义 tabBar 高度调整

后台（React）
- 新增「养护模板」「社区运营」页；用户管理加机器人筛选

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-fe/pages/record/record.js

@@ -22,10 +22,51 @@ function mapRecord(r) {
   };
 }
 
+function fmtDay(iso) {
+  if (!iso) return '';
+  const d = new Date(iso);
+  return d.getMonth() + 1 + '月' + d.getDate() + '日';
+}
+
+// 用真实体重点生成趋势图：返回 { svg(折线), dots(可点圆点，坐标为百分比) }
+function buildChart(points) {
+  const vals = points.map((p) => Number(p.value) || 0);
+  const W = 300, H = 100, pad = 12, n = vals.length;
+  let min = Math.min.apply(null, vals);
+  let max = Math.max.apply(null, vals);
+  if (max === min) max = min + 1;
+  const xs = (i) => (n === 1 ? W / 2 : pad + ((W - 2 * pad) * i) / (n - 1));
+  const ys = (v) => H - pad - ((H - 2 * pad) * (v - min)) / (max - min);
+  const pts = vals.map((v, i) => xs(i).toFixed(1) + ',' + ys(v).toFixed(1)).join(' ');
+  const svg =
+    '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 ' + W + ' ' + H + '" preserveAspectRatio="none">' +
+    '<polyline points="' + pts + '" fill="none" stroke="#73BE9D" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>' +
+    '</svg>';
+  const dots = points.map((p, i) => ({
+    xp: Number(((xs(i) / W) * 100).toFixed(2)),
+    yp: Number(((ys(vals[i]) / H) * 100).toFixed(2)),
+    value: vals[i],
+    date: fmtDay(p.occurred_at),
+    note: p.note || '',
+    delta: i > 0 ? Number((vals[i] - vals[i - 1]).toFixed(2)) : null,
+  }));
+  return { svg: 'data:image/svg+xml,' + encodeURIComponent(svg), dots };
+}
+
+const REC_PAGE = 6;
+
 Page({
   data: {
     pet: {},
     timeline: [],
+    recPage: 1,
+    recTotal: 0,
+    recHasMore: false,
+    trendSvg: '',
+    trendStats: null,
+    trendDots: [],
+    selDot: null,
+    selIdx: -1,
     sheetShow: false,
     sheetType: '',
   },
@@ -54,9 +95,61 @@ Page({
     const id = store.currentPetId();
     if (!id) return;
     api
-      .getRecords(id)
-      .then((records) => this.setData({ timeline: (records || []).map(mapRecord) }))
+      .getRecords(id, { page: 1, pageSize: REC_PAGE })
+      .then((res) => {
+        const list = (res.list || []).map(mapRecord);
+        this.setData({ timeline: list, recPage: 1, recTotal: res.total || 0, recHasMore: list.length < (res.total || 0) });
+      })
       .catch(() => {});
+    this.loadTrend();
+  },
+  loadMoreRecords() {
+    const id = store.currentPetId();
+    if (!id) return;
+    const next = this.data.recPage + 1;
+    api
+      .getRecords(id, { page: next, pageSize: REC_PAGE })
+      .then((res) => {
+        const merged = this.data.timeline.concat((res.list || []).map(mapRecord));
+        this.setData({ timeline: merged, recPage: next, recTotal: res.total || 0, recHasMore: merged.length < (res.total || 0) });
+      })
+      .catch(() => {});
+  },
+  collapseRecords() {
+    this.loadRecords();
+  },
+  loadTrend() {
+    const id = store.currentPetId();
+    if (!id) {
+      this.setData({ trendSvg: '', trendStats: null, trendDots: [], selDot: null, selIdx: -1 });
+      return;
+    }
+    api
+      .weightTrend(id)
+      .then((points) => {
+        points = points || [];
+        if (points.length < 2) {
+          this.setData({ trendSvg: '', trendStats: null, trendDots: [], selDot: null, selIdx: -1 });
+          return;
+        }
+        const vals = points.map((p) => Number(p.value) || 0);
+        const latest = vals[vals.length - 1];
+        const delta = Number((latest - vals[0]).toFixed(2));
+        const chart = buildChart(points);
+        const lastIdx = chart.dots.length - 1;
+        this.setData({
+          trendSvg: chart.svg,
+          trendDots: chart.dots,
+          selDot: chart.dots[lastIdx], // 默认选中最新一次
+          selIdx: lastIdx,
+          trendStats: { latest, delta, count: points.length },
+        });
+      })
+      .catch(() => {});
+  },
+  onTapPoint(e) {
+    const i = e.currentTarget.dataset.index;
+    this.setData({ selDot: this.data.trendDots[i], selIdx: i });
   },
   openSheet(e) {
     this.openSheetType(e.currentTarget.dataset.type);