feat: 更新后端skill服务

- 更新 skill_handler.go handler层
- 更新 skill.go model层
- 更新 skill_repo.go repository层
- 更新 skill_service.go service层
- 更新 main.go 入口文件

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/handler/skill_handler.go

@@ -2,11 +2,14 @@ package handler
 
 import (
 	"net/http"
+	"os"
+	"path/filepath"
 
 	"x-agents/server/internal/model"
 	"x-agents/server/internal/service"
 
 	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
 )
 
 // SkillHandler 技能处理器
@@ -93,21 +96,98 @@ func (h *SkillHandler) GetByID(c *gin.Context) {
 
 // Create 创建技能
 // @Summary 创建技能
-// @Description 创建新的技能
+// @Description 创建新的技能，支持文件上传。管理员用户(admin)上传为system技能，存到core/agents/skills/system/；其他用户上传为user技能，存到core/agents/skills/user/
 // @Tags 技能管理
-// @Accept json
+// @Accept multipart/form-data
 // @Produce json
-// @Param skill body model.Skill true "技能信息"
+// @Param skill_name formData string true "技能名称"
+// @Param skill_desc formData string false "技能描述"
+// @Param skill_type formData string false "技能类型(system/user)，不传则根据用户角色自动判断"
+// @Param file formData file false "技能文件(SKILL.md)"
 // @Success 200 {object} map[string]interface{} "{"message": "skill created", "skill": {}}"
 // @Router /skill/add [post]
 func (h *SkillHandler) Create(c *gin.Context) {
-	var skill model.Skill
-	if err := c.ShouldBindJSON(&skill); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+	// 获取当前用户信息
+	username, exists := c.Get("username")
+	if !exists {
+		username = ""
+	}
+	userID, _ := c.Get("userID")
+
+	skillName := c.PostForm("skill_name")
+	skillDesc := c.PostForm("skill_desc")
+	skillType := c.PostForm("skill_type")
+
+	if skillName == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "skill_name is required"})
 		return
 	}
 
-	if err := h.skillService.CreateSkill(&skill); err != nil {
+	// 确定技能类型：优先使用传入的type，否则根据用户角色判断
+	if skillType == "" {
+		// 判断是否为管理员用户
+		if username == "admin" {
+			skillType = "system"
+		} else {
+			skillType = "user"
+		}
+	}
+
+	// 获取项目根目录
+	projectRoot := h.getProjectRoot()
+	if projectRoot == "" {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "cannot find project root"})
+		return
+	}
+
+	// 根据技能类型确定存储路径
+	skillDir := "user"
+	if skillType == "system" {
+		skillDir = "system"
+	}
+
+	// 创建技能目录
+	skillPath := filepath.Join(projectRoot, "core", "agents", "skills", skillDir, skillName)
+	if err := os.MkdirAll(skillPath, 0755); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create skill directory: " + err.Error()})
+		return
+	}
+
+	// 处理文件上传
+	file, err := c.FormFile("file")
+	if err == nil {
+		// 保存上传的文件为 SKILL.md
+		skillFilePath := filepath.Join(skillPath, "SKILL.md")
+		if err := c.SaveUploadedFile(file, skillFilePath); err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to save skill file: " + err.Error()})
+			return
+		}
+	} else {
+		// 如果没有上传文件，创建一个默认的 SKILL.md
+		defaultContent := "---\nname: " + skillName + "\ndescription: " + skillDesc + "\n---\n\n# " + skillName + "\n\n" + skillDesc
+		skillFilePath := filepath.Join(skillPath, "SKILL.md")
+		if err := os.WriteFile(skillFilePath, []byte(defaultContent), 0644); err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create skill file: " + err.Error()})
+			return
+		}
+	}
+
+	// 创建技能记录
+	skill := &model.Skill{
+		ID:        uuid.New().String(),
+		SkillName: skillName,
+		SkillType: skillType,
+		SkillDesc: skillDesc,
+		Path:      filepath.Join(skillPath, "SKILL.md"),
+		Status:    "active",
+	}
+
+	// 记录创建者
+	if userIDStr, ok := userID.(string); ok {
+		skill.CreatedBy = userIDStr
+	}
+
+	if err := h.skillService.CreateSkill(skill); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
@@ -115,6 +195,35 @@ func (h *SkillHandler) Create(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "skill created", "skill": skill})
 }
 
+// getProjectRoot 获取项目根目录
+func (h *SkillHandler) getProjectRoot() string {
+	execPath, _ := os.Getwd()
+	projectRoot := execPath
+
+	// 如果当前目录名为 server，向上找一级
+	baseName := filepath.Base(execPath)
+	if baseName == "server" {
+		projectRoot = filepath.Dir(execPath)
+	}
+
+	// 尝试向上查找包含 .git 的目录
+	if _, err := os.Stat(filepath.Join(projectRoot, ".git")); os.IsNotExist(err) {
+		for i := 0; i < 3; i++ {
+			parent := filepath.Dir(projectRoot)
+			if parent == projectRoot {
+				break
+			}
+			if _, err := os.Stat(filepath.Join(parent, ".git")); err == nil {
+				projectRoot = parent
+				break
+			}
+			projectRoot = parent
+		}
+	}
+
+	return projectRoot
+}
+
 // Update 更新技能
 // @Summary 更新技能
 // @Description 更新技能信息