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/cmd/server/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/sundynix/pets-be/internal/ai"
+	"github.com/sundynix/pets-be/internal/config"
+	"github.com/sundynix/pets-be/internal/database"
+	"github.com/sundynix/pets-be/internal/handler"
+	"github.com/sundynix/pets-be/internal/router"
+	"github.com/sundynix/pets-be/internal/service"
+	"github.com/sundynix/pets-be/internal/storage"
+	appjwt "github.com/sundynix/pets-be/pkg/jwt"
+)
+
+func main() {
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatalf("load config: %v", err)
+	}
+
+	db, err := database.New(cfg)
+	if err != nil {
+		log.Fatalf("connect mysql: %v", err)
+	}
+	if err := database.Migrate(db); err != nil {
+		log.Fatalf("migrate: %v", err)
+	}
+	if err := database.Seed(db, cfg); err != nil {
+		log.Fatalf("seed: %v", err)
+	}
+
+	st, err := storage.New(cfg.MinIO)
+	if err != nil {
+		log.Fatalf("connect minio: %v", err)
+	}
+
+	engine := ai.New(cfg.AI)
+	log.Printf("AI provider: %s", engine.ProviderName())
+
+	svc := service.New(db, st, cfg, engine)
+	jm := appjwt.NewManager(cfg.JWT.Secret, cfg.JWT.ExpireHours)
+	h := handler.New(svc, jm, cfg)
+
+	r := router.New(h, jm, cfg.Server.Mode)
+
+	addr := fmt.Sprintf(":%d", cfg.Server.Port)
+	log.Printf("pets-be listening on %s  (admin: http://localhost%s/admin)", addr, addr)
+	if err := r.Run(addr); err != nil {
+		log.Fatalf("server run: %v", err)
+	}
+}