feat: завершён этап 3 - API структура Core Service

- Созданы репозитории для locations, items, operations
- Реализованы сервисы с бизнес-логикой
- Созданы HTTP handlers для всех API endpoints
- Добавлена функция GetClaims в middleware
- Обновлён server.go для интеграции всех компонентов
- Поддержка JSON полей в PostgreSQL
- Organization-scope фильтрация во всех операциях
- Валидация запросов через validator

Готово для этапа 4 - Шаблоны помещений

core-service/internal/api/handlers/items.go

@@ -0,0 +1,172 @@
+package handlers
+
+import (
+	"net/http"
+
+	"erp-mvp/core-service/internal/api/middleware"
+	"erp-mvp/core-service/internal/models"
+	"erp-mvp/core-service/internal/service"
+
+	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
+	"github.com/google/uuid"
+)
+
+type ItemHandler struct {
+	itemService service.ItemService
+	validate    *validator.Validate
+}
+
+func NewItemHandler(itemService service.ItemService) *ItemHandler {
+	return &ItemHandler{
+		itemService: itemService,
+		validate:    validator.New(),
+	}
+}
+
+// GetItems получает все товары организации
+func (h *ItemHandler) GetItems(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	items, err := h.itemService.GetItems(c.Request.Context(), claims.OrganizationID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get items"})
+		return
+	}
+
+	c.JSON(http.StatusOK, items)
+}
+
+// CreateItem создает новый товар
+func (h *ItemHandler) CreateItem(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	var req models.CreateItemRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
+		return
+	}
+
+	if err := h.validate.Struct(req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Validation failed", "details": err.Error()})
+		return
+	}
+
+	item, err := h.itemService.CreateItem(c.Request.Context(), claims.OrganizationID, &req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create item"})
+		return
+	}
+
+	c.JSON(http.StatusCreated, item)
+}
+
+// GetItem получает товар по ID
+func (h *ItemHandler) GetItem(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	idStr := c.Param("id")
+	id, err := uuid.Parse(idStr)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
+		return
+	}
+
+	item, err := h.itemService.GetItem(c.Request.Context(), id, claims.OrganizationID)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
+		return
+	}
+
+	c.JSON(http.StatusOK, item)
+}
+
+// UpdateItem обновляет товар
+func (h *ItemHandler) UpdateItem(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	idStr := c.Param("id")
+	id, err := uuid.Parse(idStr)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
+		return
+	}
+
+	var req models.CreateItemRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
+		return
+	}
+
+	if err := h.validate.Struct(req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Validation failed", "details": err.Error()})
+		return
+	}
+
+	item, err := h.itemService.UpdateItem(c.Request.Context(), id, claims.OrganizationID, &req)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
+		return
+	}
+
+	c.JSON(http.StatusOK, item)
+}
+
+// DeleteItem удаляет товар
+func (h *ItemHandler) DeleteItem(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	idStr := c.Param("id")
+	id, err := uuid.Parse(idStr)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
+		return
+	}
+
+	if err := h.itemService.DeleteItem(c.Request.Context(), id, claims.OrganizationID); err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
+		return
+	}
+
+	c.JSON(http.StatusNoContent, nil)
+}
+
+// SearchItems ищет товары
+func (h *ItemHandler) SearchItems(c *gin.Context) {
+	claims := middleware.GetClaims(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		return
+	}
+
+	query := c.Query("q")
+	category := c.Query("category")
+
+	items, err := h.itemService.SearchItems(c.Request.Context(), claims.OrganizationID, query, category)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to search items"})
+		return
+	}
+
+	c.JSON(http.StatusOK, items)
+}