feat(marketing): user profile update, ad placement management, logo limits

- Add PUT /auth/profile endpoint for nickname and avatar updates
- Add ad_placements table and CRUD admin API for managing ad units
- Add GET /marketing/ad-config public API for mini-program to fetch ad config
- Reduce logo limit from 10 to 3 per user, add 2MB file size validation

Made-with: Cursor

internal/common/auth/handler/auth_handler.go

@@ -8,6 +8,7 @@ import (
 	"github.com/gin-gonic/gin"
 
 	"wx_service/internal/common/auth/service"
+	"wx_service/internal/middleware"
 	"wx_service/internal/model"
 )
 
@@ -148,3 +149,35 @@ func (h *AuthHandler) DevLogin(c *gin.Context) {
 		},
 	}))
 }
+
+type updateProfileRequest struct {
+	Nickname  string `json:"nickname"`
+	AvatarURL string `json:"avatar_url"`
+}
+
+func (h *AuthHandler) UpdateProfile(c *gin.Context) {
+	user := middleware.MustCurrentUser(c)
+
+	var req updateProfileRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, model.Error(http.StatusBadRequest, "参数错误"))
+		return
+	}
+	if req.Nickname == "" && req.AvatarURL == "" {
+		c.JSON(http.StatusBadRequest, model.Error(http.StatusBadRequest, "请提供昵称或头像"))
+		return
+	}
+
+	updated, err := h.authService.UpdateProfile(c.Request.Context(), user.ID, req.Nickname, req.AvatarURL)
+	if err != nil {
+		log.Printf("[update_profile] error: %v", err)
+		c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "更新失败"))
+		return
+	}
+
+	c.JSON(http.StatusOK, model.Success(gin.H{
+		"id":         updated.ID,
+		"nickname":   updated.NickName,
+		"avatar_url": updated.AvatarURL,
+	}))
+}