release: 1.3.0: 1.3.0-1.3.1: security pass, queue persist, full backup layout

[1.3.0]
Security and quality after 1.2.5: domain-admin send-log authorization, fail-closed sign-in and application delete, level-2 rate-limit race fix, restore Resync, expanded tests, operator docs, release CI, and OFL for IBM Plex. Upgrading from 1.2.x is a tag bump; no migration.
Added:
  - licence: the SIL Open Font License 1.1 text now travels with the IBM Plex
  - docs: agreed roadmap item **queue-retries** — show this Postfix's retry
Security:
  - The independent security review of the send-log authorization and
Fixed:
  - test (e2e): send-log status scrapers follow the badge markup in
  - security (panel): the Deliveries list is scoped to a domain administrator's
  - mail (level-2 rate limit): the ceiling is no longer overshot by messages that
  - panel (sign-in): a session that cannot be written to the database no longer
  - panel (applications): deleting an application removes its SASL credentials
  … (2 more in CHANGELOG)
Changed:
  - docs: operator and as-built docs aligned with the code after a full
  - docs: [guide.md](docs/guide.md) reorganised into **Installation**, **Instance
  - docs: the 2026-08-13 full-tree review plan is complete — every phase (P0–P7)
  - licence: [NOTICE](NOTICE) tells modifiers to update `SourceURL` in
  - ci: the release image is published only for a **published** GitHub Release
  … (9 more in CHANGELOG)
[1.3.1]
Retry policy in the panel, persistent Postfix queue, and self-contained full backups. Mail queue and delivery history show this Postfix's first retry, backoff cap, and queue lifetime. Deferred mail survives container recreate. Full backups now archive `data/`, compose, `.env`, and `certs/`; the archive layout breaks 1.3.0 flat backups (unpack those with `tar xzf backup.tar.gz -C ./data` as before). Upgrading from 1.3.0 is a tag bump; no schema migration.
Added:
  - Mail queue and a delivery's history show this Postfix's retry policy
  - docs: **Plan checklists** in [development.md](docs/development.md) — format,
  - docs: **Implementation checklists** with model routing in
  - docs: roadmap candidates **send-log-retention** (panel Settings for delivery
  - Postfix queue under `/data/postfix/queue` — deferred and active mail survive
  … (1 more in CHANGELOG)
Changed:
  - **Breaking:** full-backup archive layout — paths are prefixed with `data/`;
  - docs: operator guide, architecture, security, and backup UI updated for
  - docs: HTML mockups for a full panel UI refresh
Changed:
  - docs: panel UI mockups after review — Status restored to live readings
  - docs: panel UI design system and mockups rebuilt as separate pages
  - docs: panel UI mockups — add-domain sits in the list card (Domains and
Fixed:
  - ci (GHCR): per-arch package tags (`X.Y.Z-amd64`, `X.Y.Z-arm64`) are dropped

Squashed CHANGELOG sections: [1.3.0], [1.3.1].

Full detail: CHANGELOG.md (1.3.0, 1.3.1).

internal/web/handlers/handlers_backup.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/mixeme/selfpost/internal/backup"
@@ -70,6 +71,11 @@ func (h *Handlers) HandleBackup(w http.ResponseWriter, r *http.Request) {
 		h.renderBackupPageWith(w, r, http.StatusBadRequest, "", pwErr)
 		return
 	}
+	if err := backup.ValidateDeployRoot(h.cfg.DeployRoot); err != nil {
+		logf("panel: full backup: %v", err)
+		h.renderBackupPageWith(w, r, http.StatusBadRequest, "", deployBackupErr(err))
+		return
+	}
 
 	stamp := time.Now().UTC().Format("20060102-150405")
 	filename := fmt.Sprintf("selfpost-backup-%s.tar.gz", stamp)
@@ -105,9 +111,13 @@ func (h *Handlers) HandleBackup(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := backup.Create(sink, backup.Params{
-		DataDir: h.cfg.DataDir,
-		DBPath:  h.cfg.DBPath,
-		Version: h.cfg.Version,
+		DataDir:    h.cfg.DataDir,
+		DBPath:     h.cfg.DBPath,
+		Version:    h.cfg.Version,
+		DeployRoot: h.cfg.DeployRoot,
+		OnWarn: func(msg string) {
+			logf("panel: full backup: %s", msg)
+		},
 	}); err != nil {
 		logf("panel: full backup failed: %v", err)
 		return
@@ -310,6 +320,14 @@ func decryptErrorMessage(err error) string {
 	}
 }
 
+// deployBackupErr phrases a pre-flight backup failure for the operator.
+func deployBackupErr(err error) string {
+	if strings.Contains(err.Error(), "DeployRoot") || strings.Contains(err.Error(), "deploy root") {
+		return "Full backup needs the project directory mounted read-only at /selfpost-deploy — add <code>.:/selfpost-deploy:ro</code> to docker-compose.yml and recreate the container."
+	}
+	return "Could not create the backup: " + err.Error()
+}
+
 // importErrorMessage maps a domain-import failure (already logged by the caller)
 // to an HTTP status and a user-facing message. Duplicate domain/login are called
 // out specifically; other failures — validation errors describing what is wrong