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markdown report file via --from-report when the cache is outdated.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/linter/rules.go

@@ -30,9 +30,9 @@ const (
 // Issue is a single lint problem found.
 type Issue struct {
 	Rule     Rule
+	Message  string
 	Severity Severity
 	Line     int
-	Message  string
 }
 
 func (i Issue) String() string {
@@ -79,7 +79,11 @@ func CheckSorted(entries []parser.Entry) []Issue {
 				Rule:     RuleSorted,
 				Severity: SeverityError,
 				Line:     entries[i].Line,
-				Message:  fmt.Sprintf("%q should come before %q (alphabetical order)", entries[i].Name, entries[i-1].Name),
+				Message: fmt.Sprintf(
+					"%q should come before %q (alphabetical order)",
+					entries[i].Name,
+					entries[i-1].Name,
+				),
 			})
 		}
 	}