init: 毛孩子计划 小程序 + Go 后端 + 内嵌后台

- pets-fe: 微信原生小程序（首页/计划/记录/报告/社区/引导），
  服务端驱动、无假数据；弹层改用 scroll-view，打开时隐藏自定义 tabBar
- pets-be: Gin + GORM(MySQL, sundynix_ 前缀) + MinIO，统一响应/分页，
  微信 code2session 登录，provider-neutral AI(DeepSeek)，go:embed React 后台
- 修复：分段选择类型不匹配（字符串 vs 数字）导致选不中

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

pets-fe/app.json

@@ -0,0 +1,32 @@
+{
+  "pages": [
+    "pages/onboarding/onboarding",
+    "pages/home/home",
+    "pages/plan/plan",
+    "pages/record/record",
+    "pages/report/report",
+    "pages/community/community",
+    "pages/learn/learn",
+    "pages/profile/profile"
+  ],
+  "window": {
+    "navigationStyle": "custom",
+    "backgroundColor": "#F8F6F2",
+    "backgroundTextStyle": "dark"
+  },
+  "tabBar": {
+    "custom": true,
+    "color": "#8D8277",
+    "selectedColor": "#DD8420",
+    "backgroundColor": "#FFFFFF",
+    "list": [
+      { "pagePath": "pages/home/home", "text": "首页" },
+      { "pagePath": "pages/plan/plan", "text": "计划" },
+      { "pagePath": "pages/record/record", "text": "记录" },
+      { "pagePath": "pages/report/report", "text": "报告" },
+      { "pagePath": "pages/community/community", "text": "社区" }
+    ]
+  },
+  "sitemapLocation": "sitemap.json",
+  "style": "v2"
+}