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markdown report file via --from-report when the cache is outdated.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

@@ -38,17 +38,17 @@ func LoadExcludeList(path string) (*ExcludeList, error) {
 
 // HealthEntry stores metadata about a single entry.
 type HealthEntry struct {
-	URL        string    `yaml:"url"`
-	Name       string    `yaml:"name"`
-	Status     string    `yaml:"status"` // healthy, inactive, stale, archived, dead
-	Stars      int       `yaml:"stars,omitempty"`
-	Forks      int       `yaml:"forks,omitempty"`
-	LastPush   time.Time `yaml:"last_push,omitempty"`
-	HasLicense  bool      `yaml:"has_license,omitempty"`
-	HasReadme   bool      `yaml:"has_readme,omitempty"`
+	LastPush    time.Time `yaml:"last_push,omitempty"`
 	CheckedAt   time.Time `yaml:"checked_at"`
+	URL         string    `yaml:"url"`
+	Name        string    `yaml:"name"`
+	Status      string    `yaml:"status"`
 	Category    string    `yaml:"category,omitempty"`
 	Description string    `yaml:"description,omitempty"`
+	Stars       int       `yaml:"stars,omitempty"`
+	Forks       int       `yaml:"forks,omitempty"`
+	HasLicense  bool      `yaml:"has_license,omitempty"`
+	HasReadme   bool      `yaml:"has_readme,omitempty"`
 }
 
 // HealthCache is the full YAML cache file.
@@ -84,15 +84,17 @@ func SaveHealthCache(path string, hc *HealthCache) error {
 // Merge updates the cache with new entries, replacing existing ones by URL.
 func (hc *HealthCache) Merge(entries []HealthEntry) {
 	index := make(map[string]int)
-	for i, e := range hc.Entries {
+	for i := range hc.Entries {
+		e := &hc.Entries[i]
 		index[e.URL] = i
 	}
-	for _, e := range entries {
-		if i, exists := index[e.URL]; exists {
-			hc.Entries[i] = e
+	for i := range entries {
+		e := &entries[i]
+		if j, exists := index[e.URL]; exists {
+			hc.Entries[j] = *e
 		} else {
 			index[e.URL] = len(hc.Entries)
-			hc.Entries = append(hc.Entries, e)
+			hc.Entries = append(hc.Entries, *e)
 		}
 	}
 }