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  - Unused legacy asset `docs/assets/icon.png` (superseded by the four brand SVGs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).

docs/assets/selfpost-proof.html

@@ -86,6 +86,14 @@
   <p>Марка-надпись: имя — само поле знака, край держат зубцовка и волосяной контур. Один файл работает на светлой и тёмной теме.</p>
 </header>
 
+<section>
+  <h2>Positioning</h2>
+  <div class="note"><b>Stamp subtitle:</b> SELF-HOSTED SMTP RELAY (unchanged on the mark).<br>
+  <b>Tagline:</b> YOUR SMTP. YOUR RULES.<br>
+  <b>Hero line (README, GitHub):</b> Self-hosted SMTP relay with a web panel — one Docker image, no provider.<br>
+  Canonical copy also lives in <code>docs/product.md</code> § Positioning.</div>
+</section>
+
 <section>
   <h2>Эталон</h2>
   <div class="hero"><svg class="" viewBox="0 0 330 150" width="330" height="150" role="img" aria-label="SelfPost — self-hosted SMTP relay">
@@ -121,7 +129,7 @@
 <text x="165.0" y="115" text-anchor="middle" font-family="'IBM Plex Mono',monospace" font-size="11.5" letter-spacing=".15" fill="#F6EDE2">SELF-HOSTED SMTP RELAY</text>
 </svg>
         <h3>SelfPost</h3>
-        <p>Self-hosted outbound SMTP relay with a web control panel, shipped as a single Docker image.</p></div>
+        <p>Self-hosted SMTP relay with a web panel — one Docker image, no provider.</p></div>
     </div><div class="cap"><b>light</b><br>Тёплое поле отделяет марку от белого GitHub, контур ловит край.</div></div>
     <div><div class="gh dk">
       <div class="bc">mixeme / <b>selfpost</b></div>
@@ -135,7 +143,7 @@
 <text x="165.0" y="115" text-anchor="middle" font-family="'IBM Plex Mono',monospace" font-size="11.5" letter-spacing=".15" fill="#F6EDE2">SELF-HOSTED SMTP RELAY</text>
 </svg>
         <h3>SelfPost</h3>
-        <p>Self-hosted outbound SMTP relay with a web control panel, shipped as a single Docker image.</p></div>
+        <p>Self-hosted SMTP relay with a web panel — one Docker image, no provider.</p></div>
     </div><div class="cap"><b>dark</b><br>Тот же файл: на тёмном работает поле, контур просто исчезает.</div></div>
   </div>
 </section>