refactor: upgrade to Go 1.26 and modernize code idioms

- Replace `interface{}` with `any` type alias across all packages
- Use built-in `min()`/`max()` for parameter clamping
- Use `slices.SortFunc`, `slices.Min`, `slices.Max` for cleaner code
- Use `strings.Cut()` for simpler string parsing in auth middleware
- Use `errors.Is()` for proper error comparison in handlers
- Update dependencies: golang.org/x/image 0.37.0 -> 0.38.0
- Add Wire code generation guidelines to ARCHITECTURE.md
- Disable Go cache in CI build workflow

internal/handler/material_handler.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"errors"
 	"strconv"
 
 	"carrot_bbs/internal/dto"
@@ -39,21 +40,21 @@ type subjectResponse struct {
 }
 
 type materialResponse struct {
-	ID            string            `json:"id"`
-	SubjectID     string            `json:"subject_id"`
-	Title         string            `json:"title"`
-	Description   string            `json:"description,omitempty"`
-	FileType      string            `json:"file_type"`
-	FileSize      int64             `json:"file_size"`
-	FileURL       string            `json:"file_url"`
-	FileName      string            `json:"file_name"`
-	DownloadCount int               `json:"download_count"`
-	AuthorID      string            `json:"author_id,omitempty"`
-	Tags          []string          `json:"tags,omitempty"`
-	Status        string            `json:"status"`
-	CreatedAt     string            `json:"created_at"`
-	UpdatedAt     string            `json:"updated_at"`
-	Subject       *subjectResponse  `json:"subject,omitempty"`
+	ID            string           `json:"id"`
+	SubjectID     string           `json:"subject_id"`
+	Title         string           `json:"title"`
+	Description   string           `json:"description,omitempty"`
+	FileType      string           `json:"file_type"`
+	FileSize      int64            `json:"file_size"`
+	FileURL       string           `json:"file_url"`
+	FileName      string           `json:"file_name"`
+	DownloadCount int              `json:"download_count"`
+	AuthorID      string           `json:"author_id,omitempty"`
+	Tags          []string         `json:"tags,omitempty"`
+	Status        string           `json:"status"`
+	CreatedAt     string           `json:"created_at"`
+	UpdatedAt     string           `json:"updated_at"`
+	Subject       *subjectResponse `json:"subject,omitempty"`
 }
 
 // =====================================================
@@ -170,11 +171,11 @@ func (h *MaterialHandler) ListMaterials(c *gin.Context) {
 	}
 
 	response.Success(c, gin.H{
-		"list":       result,
-		"total":      total,
-		"page":       page,
-		"page_size":  pageSize,
-		"has_more":   int64(page*pageSize) < total,
+		"list":      result,
+		"total":     total,
+		"page":      page,
+		"page_size": pageSize,
+		"has_more":  int64(page*pageSize) < total,
 	})
 }
 
@@ -305,7 +306,7 @@ func (h *MaterialHandler) AdminUpdateSubject(c *gin.Context) {
 func (h *MaterialHandler) AdminDeleteSubject(c *gin.Context) {
 	id := c.Param("id")
 	if err := h.materialService.DeleteSubject(id); err != nil {
-		if err == service.ErrSubjectHasMaterials {
+		if errors.Is(err, service.ErrSubjectHasMaterials) {
 			response.BadRequest(c, "学科下存在资料，无法删除")
 			return
 		}