release: 1.9.2: Review pass: port-25 milters, DMARC validation, rate-limit fix

Review pass over `1.4.0`…`1.9.1`: port 25 no longer shares the submission milter chain, DMARC reports are validated before they are stored, and the auto rate limit is correct for a non-default level-1 window. Schema migration `0010` (index only). Upgrading is a tag bump.
Added:
  - SQLite migration `0010_send_log_app_login_index.sql` —
  - DMARC aggregate reports are accepted as **zip** as well as gzip or plain XML
  - e2e: `checkPort25ConfigCombinations` regenerates the Postfix configuration
Changed:
  - README hero line and a **Positioning** block in `docs/product.md` record the
Fixed:
  - The setup account's password is hashed at bcrypt cost `12` like every other
  - Login/setup rate limiter: protecting blocked buckets from eviction is now
  - `postqueue -p` output is bounded to 4 MiB (the timeout alone left the size of
  - [schema-migrations.md](docs/schema-migrations.md): the schema section was
  - postqueue reader is now time-bounded: `postqueue -p` runs under a 5-second
  … (11 more in CHANGELOG)
Changed:
  - [roadmap.md](docs/roadmap.md) now carries everything the 2026-08-19 code
  - Extracted `internal/configsafe` — the empty-value and forbidden-character
  - Build, deploy and migration comments no longer cite the archived
  - Dropped the `parseDomainRateLimitForm` / `parseAppRateLimitForm` pass-through
  - Extracted shared helpers: `internal/atomicfile` (atomic temp-write+rename) and
  … (7 more in CHANGELOG)
Removed:
  - Unused legacy asset `docs/assets/icon.png` (superseded by the four brand SVGs
  - Plan documents for already-shipped features: `domain-stats-auto-ratelimit`,

Full detail: CHANGELOG.md (1.9.2).

internal/domain/transfer.go

@@ -19,14 +19,14 @@ const FormatDomainExport = "selfpost-domain-export"
 // transfer without regeneration). The file is therefore as sensitive as a full
 // backup and must be handled as a secret.
 type DomainExport struct {
-	Format         string      `json:"format"`
-	Version        string      `json:"version"`
-	Domain         string      `json:"domain"`
-	DKIMSelector   string      `json:"dkim_selector"`
-	DKIMPrivateKey string      `json:"dkim_private_key"`    // PKCS#1 PEM
-	DMARCRua       *string     `json:"dmarc_rua,omitempty"` // nil = inherit profile; set = override ("" = none)
+	Format         string           `json:"format"`
+	Version        string           `json:"version"`
+	Domain         string           `json:"domain"`
+	DKIMSelector   string           `json:"dkim_selector"`
+	DKIMPrivateKey string           `json:"dkim_private_key"`    // PKCS#1 PEM
+	DMARCRua       *string          `json:"dmarc_rua,omitempty"` // nil = inherit profile; set = override ("" = none)
 	RateLimit      *RateLimitExport `json:"rate_limit,omitempty"`
-	Applications   []AppExport `json:"applications"`
+	Applications   []AppExport      `json:"applications"`
 }
 
 // RateLimitExport is the transferable level-2 limit for a domain or application.
@@ -40,13 +40,13 @@ type RateLimitExport struct {
 
 // AppExport is one application within a DomainExport.
 type AppExport struct {
-	Login            string   `json:"login"`
-	AddressMode      string   `json:"address_mode"`
-	Addresses        []string `json:"addresses,omitempty"` // list mode only
-	Password         string   `json:"password"`
-	AuthIPRestrict   bool     `json:"auth_ip_restrict,omitempty"`
-	AuthAllowedIPs   []string `json:"auth_allowed_ips,omitempty"`
-	RateLimit        *RateLimitExport `json:"rate_limit,omitempty"`
+	Login          string           `json:"login"`
+	AddressMode    string           `json:"address_mode"`
+	Addresses      []string         `json:"addresses,omitempty"` // list mode only
+	Password       string           `json:"password"`
+	AuthIPRestrict bool             `json:"auth_ip_restrict,omitempty"`
+	AuthAllowedIPs []string         `json:"auth_allowed_ips,omitempty"`
+	RateLimit      *RateLimitExport `json:"rate_limit,omitempty"`
 }
 
 // Export builds the transferable representation of a domain: its DKIM key, its
@@ -78,7 +78,11 @@ func (s *Service) Export(id int64) (DomainExport, error) {
 		s := d.DMARCRua.String
 		exp.DMARCRua = &s
 	}
-	if rl, ok, err := s.store.GetRateLimit(store.RateLimitScopeDomain, id); err == nil && ok {
+	rl, ok, err := s.store.GetRateLimit(store.RateLimitScopeDomain, id)
+	if err != nil {
+		return DomainExport{}, fmt.Errorf("export rate limit for %s: %w", d.Name, err)
+	}
+	if ok {
 		exp.RateLimit = exportRateLimit(rl)
 	}
 	for _, a := range apps {
@@ -94,8 +98,12 @@ func (s *Service) Export(id int64) (DomainExport, error) {
 			AuthIPRestrict: a.AuthIPRestrict,
 			AuthAllowedIPs: a.AuthAllowedIPs,
 		}
-		if rl, ok, err := s.store.GetRateLimit(store.RateLimitScopeApp, a.ID); err == nil && ok {
-			appExp.RateLimit = exportRateLimit(rl)
+		appRL, ok, err := s.store.GetRateLimit(store.RateLimitScopeApp, a.ID)
+		if err != nil {
+			return DomainExport{}, fmt.Errorf("export rate limit for %s: %w", a.Login, err)
+		}
+		if ok {
+			appExp.RateLimit = exportRateLimit(appRL)
 		}
 		exp.Applications = append(exp.Applications, appExp)
 	}