chore(deps): bump golangci-lint to v2.10.0 and suppress new gosec false positives

Bump golangci-lint from v2.9.0 to v2.10.0, which includes a newer gosec
with additional taint-analysis rules (G117, G703, G704, G705) and a
stricter G101 check. Added inline //nolint:gosec comments to suppress
21 false positives across 19 files: struct fields flagged as secrets
(G117), w.Write calls flagged as XSS (G705), HTTP client calls flagged
as SSRF (G704), os.Stat/os.ReadFile/os.Remove flagged as path traversal
(G703), and a sort mapping flagged as hardcoded credentials (G101).

Signed-off-by: Deluan <deluan@navidrome.org>

server/backgrounds/handler.go

@@ -80,7 +80,7 @@ func (h *Handler) serveImage(ctx context.Context, item cache.Item) (io.Reader, e
 	}
 	c := http.Client{Timeout: imageRequestTimeout}
 	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, imageURL(image), nil)
-	resp, err := c.Do(req) //nolint:bodyclose // No need to close resp.Body, it will be closed via the CachedStream wrapper
+	resp, err := c.Do(req) //nolint:bodyclose,gosec // No need to close resp.Body, it will be closed via the CachedStream wrapper
 	if errors.Is(err, context.DeadlineExceeded) {
 		defaultImage, _ := base64.StdEncoding.DecodeString(consts.DefaultUILoginBackgroundOffline)
 		return strings.NewReader(string(defaultImage)), nil