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/internal/database/database.go

@@ -0,0 +1,48 @@
+package database
+
+import (
+	"fmt"
+	"time"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+	"gorm.io/gorm/schema"
+
+	"github.com/sundynix/pets-be/internal/config"
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// New 建立 GORM 连接，所有表名统一加 sundynix_ 前缀
+func New(cfg *config.Config) (*gorm.DB, error) {
+	logLevel := logger.Info
+	if cfg.Server.Mode == "release" {
+		logLevel = logger.Warn
+	}
+
+	db, err := gorm.Open(mysql.Open(cfg.MySQL.DSN()), &gorm.Config{
+		NamingStrategy: schema.NamingStrategy{
+			TablePrefix:   "sundynix_",
+			SingularTable: false,
+		},
+		Logger: logger.Default.LogMode(logLevel),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("gorm open: %w", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		return nil, err
+	}
+	sqlDB.SetMaxOpenConns(50)
+	sqlDB.SetMaxIdleConns(10)
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
+	return db, nil
+}
+
+// Migrate 自动建表
+func Migrate(db *gorm.DB) error {
+	return db.AutoMigrate(model.AllModels()...)
+}

pets-be/internal/database/seed.go

@@ -0,0 +1,53 @@
+package database
+
+import (
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+
+	"github.com/sundynix/pets-be/internal/config"
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// Seed 初始化种子数据：管理员账号 + 新手文章
+func Seed(db *gorm.DB, cfg *config.Config) error {
+	if err := seedAdmin(db, cfg); err != nil {
+		return err
+	}
+	return seedArticles(db)
+}
+
+func seedAdmin(db *gorm.DB, cfg *config.Config) error {
+	var count int64
+	if err := db.Model(&model.Admin{}).Where("username = ?", cfg.Admin.Username).Count(&count).Error; err != nil {
+		return err
+	}
+	if count > 0 {
+		return nil
+	}
+	hash, err := bcrypt.GenerateFromPassword([]byte(cfg.Admin.Password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+	return db.Create(&model.Admin{
+		Username:     cfg.Admin.Username,
+		PasswordHash: string(hash),
+		Role:         "admin",
+	}).Error
+}
+
+func seedArticles(db *gorm.DB) error {
+	var count int64
+	if err := db.Model(&model.Article{}).Count(&count).Error; err != nil {
+		return err
+	}
+	if count > 0 {
+		return nil
+	}
+	articles := []model.Article{
+		{Icon: "💉", Title: "幼猫疫苗和驱虫怎么安排？", Description: "适合搜索流量和社群传播，引导生成提醒。", Category: "vaccine", RelatedSheetType: "vaccine", Published: true},
+		{Icon: "💩", Title: "猫咪软便要不要去医院？", Description: "接异常记录和 AI 观察建议。", Category: "symptom", RelatedSheetType: "symptom", Published: true},
+		{Icon: "🍽️", Title: "7 天换粮计划怎么做？", Description: "接计划模板，适合一次性付费。", Category: "food", RelatedSheetType: "applyPlan", Published: true},
+		{Icon: "💰", Title: "一个月养猫大概花多少钱？", Description: "接养宠账本和年度账单。", Category: "cost", RelatedSheetType: "cost", Published: true},
+	}
+	return db.Create(&articles).Error
+}