feat: logins list/default, actions run delete, date filters, label update alias

- fgj logins {list,default}: complementary UI to 'fgj auth'. 'list'
  shows all configured hosts (hostname, user, protocol, default flag,
  match_dirs) with --json. 'default [hostname]' gets or sets which
  host wins in resolution when no other signal is present.
  Adds 'Default bool' field to HostConfig; GetHost consults it between
  match_dirs and the codeberg.org fallback. Multiple defaults tolerated
  with a stderr warning; alphabetical-first wins.

- fgj actions run delete: delete a completed workflow run via raw
  DELETE (SDK v0.23.2 has no DeleteRepoActionRun). Fetches run first
  and refuses to delete non-terminal states unless --force; suggests
  'actions run cancel' for those. Confirmation prompt unless --yes.

- pr list / issue list gain --since and --before date filter flags.
  Accepts YYYY-MM-DD, RFC 3339, YYYY-MM-DD HH:MM:SS, and relative
  deltas (7d, 24h, 2w, 1m — months=30 days). Issues use server-side
  filter via ListIssueOption.Since/Before; PRs fall back to client-side
  (SDK lacks Since/Before on ListPullRequestsOptions).

- fgj label update added as alias for 'fgj label edit' (tea-compat).

All changes:
  cmd/logins.go (new, 140 LOC)
  cmd/actions_run_delete.go (new, ~85 LOC)
  cmd/pr.go, cmd/issue.go (+parseDateArg helper, filter wiring)
  cmd/label.go (1-line alias)
  internal/config/config.go (Default field + DefaultHost method)
  CHANGELOG.md
Built in parallel by three sub-agents; plus the label alias done
serially. go build / go vet / go test -race all clean.

cmd/issue.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
+	"time"
 
 	"code.gitea.io/sdk/gitea"
 	"forgejo.zerova.net/public/fgj-sid/internal/api"
@@ -29,7 +30,13 @@ var issueListCmd = &cobra.Command{
   fgj issue list -s closed -R owner/repo
 
   # Output as JSON
-  fgj issue list --json`,
+  fgj issue list --json
+
+  # PRs updated in the last 7 days
+  fgj pr list --since 7d
+
+  # Issues touched between two dates
+  fgj issue list --since 2026-04-01 --before 2026-04-15`,
 	RunE: runIssueList,
 }
 
@@ -152,6 +159,8 @@ func init() {
 	issueListCmd.Flags().String("author", "", "Filter by author username")
 	issueListCmd.Flags().StringSliceP("label", "l", nil, "Filter by label names")
 	issueListCmd.Flags().StringP("search", "S", "", "Search keyword filter")
+	issueListCmd.Flags().String("since", "", "Only items updated at or after this date (YYYY-MM-DD, RFC 3339, or relative like 7d)")
+	issueListCmd.Flags().String("before", "", "Only items updated strictly before this date (YYYY-MM-DD, RFC 3339, or relative like 1d)")
 	addJSONFlags(issueListCmd, "Output issues as JSON")
 
 	issueViewCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")
@@ -192,6 +201,24 @@ func runIssueList(cmd *cobra.Command, args []string) error {
 	author, _ := cmd.Flags().GetString("author")
 	labels, _ := cmd.Flags().GetStringSlice("label")
 	search, _ := cmd.Flags().GetString("search")
+	sinceStr, _ := cmd.Flags().GetString("since")
+	beforeStr, _ := cmd.Flags().GetString("before")
+
+	var sinceTime, beforeTime time.Time
+	if sinceStr != "" {
+		t, err := parseDateArg(sinceStr)
+		if err != nil {
+			return fmt.Errorf("invalid --since: %w", err)
+		}
+		sinceTime = t
+	}
+	if beforeStr != "" {
+		t, err := parseDateArg(beforeStr)
+		if err != nil {
+			return fmt.Errorf("invalid --before: %w", err)
+		}
+		beforeTime = t
+	}
 
 	owner, name, err := parseRepo(repo)
 	if err != nil {
@@ -227,6 +254,8 @@ func runIssueList(cmd *cobra.Command, args []string) error {
 		KeyWord:     search,
 		CreatedBy:   author,
 		AssignedBy:  assignee,
+		Since:       sinceTime,
+		Before:      beforeTime,
 		ListOptions: gitea.ListOptions{PageSize: limit},
 	})
 	ios.StopSpinner()