feat: add prune subcommand, drop archived/stale entries (#1441)

* feat: add prune subcommand, drop archived/stale entries, add container-explorer

Add a new `awesome-docker prune` subcommand that removes README entries
whose repository health status matches a configurable set (default:
archived,stale). URLs are read from the local health cache, or from a
markdown report file via --from-report when the cache is outdated.

Apply it against the issue #1439 health report to remove 5 entries
that survived the recent reorg: stitchocker, docker-consul,
blockbridge-docker-volume, docker-explorer, dockdash.

Add google/container-explorer in the Security section as the actively
maintained successor to the now-archived google/docker-explorer.

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

* golangci-lint config

* fix: address golangci-lint findings

Fixes errcheck on bufio.Writer.WriteString, gocritic rangeValCopy via
indexed loops with pointer locals, gosec G703 on user-supplied CLI
output path, noctx by switching to exec.CommandContext with a timeout
in the TUI url opener, prealloc in the scorer test, plus fieldalignment
struct reorders and golines line breaks from --fix.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

internal/parser/parser_test.go

@@ -19,7 +19,11 @@ func TestParseEntry(t *testing.T) {
 		t.Errorf("url = %q, want %q", entry.URL, "https://www.docker.com/products/docker-desktop/")
 	}
 	if entry.Description != "Official native app. Only for Windows and MacOS." {
-		t.Errorf("description = %q, want %q", entry.Description, "Official native app. Only for Windows and MacOS.")
+		t.Errorf(
+			"description = %q, want %q",
+			entry.Description,
+			"Official native app. Only for Windows and MacOS.",
+		)
 	}
 	if len(entry.Markers) != 0 {
 		t.Errorf("markers = %v, want empty", entry.Markers)