feat: lazysecrets list prints everything lazysecrets can find, for fzf and editor pickers (#70)

`lazysecrets list` prints every source, vault and secret lazysecrets can find, one per line, for fzf, editor pickers and scripts: what Go to searches, without the TUI. What's cached prints at once; what's missing or older than `--max-age` loads in the background and streams in. It stops when the reader goes (a pick in fzf), saving what it loaded.

- Text: kind, mark (✗/⚠, ★, ◷ and the provider icon), name, status (why it couldn't be read, or expired / expires in 12d), note, account and link, tab-separated; kind first and account and link last, so new fields go between. Coloured from the theme; `--color never`, `--icons=false`, `--stars=false`, `--recent`, `--notes=false`, `--expiry=false`.
- `--format json`: an object per line, with starred, recent, lastUsed and uses, expires, enabled, note, reference and url too.
- `--kind` lists only some kinds, and doesn't load lists only other kinds need; `--cached` loads nothing.
- `lazysecrets open --action go|copy|show` skips the "what to do" menu and ends in the list, like Go to; `open` and `get` take `--account`, the account list printed, rather than asking which.
- The cache file moved to `internal/cachefile`: saves merge with the file under a lock, so list and the TUI don't undo each other.
- `ui.recentIcon` marks items used lately with ◷ in the TUI's lists too; Recent now means the last 90 days.
- --demo has stars, notes, recent use, and expired, expiring and disabled secrets.
- docs/integration.md documents get, list and an fzf picker; docs/links.md is docs/sharing.md.

Reviewed-on: #70
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/store/store_test.go

@@ -119,3 +119,15 @@ func TestStarsPerAccount(t *testing.T) {
 		t.Errorf("unstar alice: %v", n.StarredBy)
 	}
 }
+
+func TestUsedLately(t *testing.T) {
+	now := time.Now()
+	for ago, want := range map[time.Duration]bool{time.Hour: true, 89 * 24 * time.Hour: true, 2 * 365 * 24 * time.Hour: false} {
+		if got := (Node{LastUsed: now.Add(-ago)}).UsedLately(now); got != want {
+			t.Errorf("used %v ago: %v", ago, got)
+		}
+	}
+	if (Node{}).UsedLately(now) {
+		t.Error("never used is lately")
+	}
+}