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/pkg/crypto/batch_decrypt.go

@@ -86,7 +86,7 @@ func (e *MessageEncryptor) DecryptMessageSegments(ciphertext string) ([]byte, er
 
 // TryParseMessageSegments 尝试解析消息段
 // 先尝试解密，如果失败则尝试直接解析（兼容未加密的旧数据）
-func TryParseMessageSegments(ciphertext string, segments interface{}) error {
+func TryParseMessageSegments(ciphertext string, segments any) error {
 	if ciphertext == "" {
 		return nil
 	}