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/middleware/auth.go

@@ -0,0 +1,77 @@
+package middleware
+
+import (
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/sundynix/pets-be/pkg/errcode"
+	appjwt "github.com/sundynix/pets-be/pkg/jwt"
+	"github.com/sundynix/pets-be/pkg/response"
+)
+
+// gin.Context 中存放身份的 key
+const (
+	CtxUserID  = "userID"
+	CtxAdminID = "adminID"
+	CtxName    = "name"
+)
+
+func bearer(c *gin.Context) string {
+	h := c.GetHeader("Authorization")
+	if h == "" {
+		return ""
+	}
+	if strings.HasPrefix(h, "Bearer ") {
+		return strings.TrimPrefix(h, "Bearer ")
+	}
+	return h
+}
+
+// AuthUser 小程序用户鉴权
+func AuthUser(jm *appjwt.Manager) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		claims, err := jm.Parse(bearer(c))
+		if err != nil || claims.Kind != appjwt.KindUser {
+			response.Abort(c, errcode.ErrUnauthized, "")
+			return
+		}
+		c.Set(CtxUserID, claims.ID)
+		c.Set(CtxName, claims.Name)
+		c.Next()
+	}
+}
+
+// AuthAdmin 后台管理员鉴权
+func AuthAdmin(jm *appjwt.Manager) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		claims, err := jm.Parse(bearer(c))
+		if err != nil || claims.Kind != appjwt.KindAdmin {
+			response.Abort(c, errcode.ErrUnauthized, "")
+			return
+		}
+		c.Set(CtxAdminID, claims.ID)
+		c.Set(CtxName, claims.Name)
+		c.Next()
+	}
+}
+
+// UserID 从上下文取当前用户 ID
+func UserID(c *gin.Context) uint {
+	if v, ok := c.Get(CtxUserID); ok {
+		if id, ok := v.(uint); ok {
+			return id
+		}
+	}
+	return 0
+}
+
+// AdminID 从上下文取当前管理员 ID
+func AdminID(c *gin.Context) uint {
+	if v, ok := c.Get(CtxAdminID); ok {
+		if id, ok := v.(uint); ok {
+			return id
+		}
+	}
+	return 0
+}

pets-be/internal/middleware/cors.go

@@ -0,0 +1,28 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// CORS 开发期允许跨域（小程序无跨域限制，主要给后台 SPA dev server 用）
+func CORS() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		origin := c.GetHeader("Origin")
+		if origin != "" {
+			c.Header("Access-Control-Allow-Origin", origin)
+		} else {
+			c.Header("Access-Control-Allow-Origin", "*")
+		}
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Authorization")
+		c.Header("Access-Control-Allow-Credentials", "true")
+
+		if c.Request.Method == http.MethodOptions {
+			c.AbortWithStatus(http.StatusNoContent)
+			return
+		}
+		c.Next()
+	}
+}