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-be/deployments/docker-compose.yml

@@ -0,0 +1,45 @@
+services:
+  mysql:
+    image: mysql:8.0
+    container_name: pets-mysql
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: pets
+      TZ: Asia/Shanghai
+    command:
+      - --character-set-server=utf8mb4
+      - --collation-server=utf8mb4_unicode_ci
+      - --default-authentication-plugin=mysql_native_password
+    ports:
+      - "3306:3306"
+    volumes:
+      - mysql_data:/var/lib/mysql
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-uroot", "-proot"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
+  minio:
+    image: minio/minio:latest
+    container_name: pets-minio
+    restart: unless-stopped
+    environment:
+      MINIO_ROOT_USER: sundynix
+      MINIO_ROOT_PASSWORD: sundynix
+    command: server /data --console-address ":9001"
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    volumes:
+      - minio_data:/data
+    healthcheck:
+      test: ["CMD", "mc", "ready", "local"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
+volumes:
+  mysql_data:
+  minio_data: