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  - Unused legacy asset `docs/assets/icon.png` (superseded by the four brand SVGs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/panel-redesign/panel/src/setup.html

@@ -0,0 +1,30 @@
+<!-- title: Create administrator | shell: bare -->
+<div class="columns is-gapless sp-signin">
+  <div class="column is-half sp-signin-brand">
+    <div>
+      <img src="../../selfpost-stamp.svg" alt="SelfPost">
+      <p>YOUR SMTP. YOUR RULES.</p>
+    </div>
+  </div>
+  <div class="column is-half sp-signin-form">
+    <form class="sp-form" method="post" action="overview.html">
+      <p class="sp-kicker">First run · one-time link</p>
+      <h1 class="title is-3">Create administrator</h1>
+      <p class="sp-muted mb-4">This link creates the single global administrator. After you submit, it stops working for good.</p>
+      <div class="field">
+        <label class="label" for="username">Username</label>
+        <div class="control has-icons-left"><input class="input" id="username" name="username" autocomplete="username" required><span class="icon is-left"><i class="ti ti-user"></i></span></div>
+      </div>
+      <div class="field">
+        <label class="label" for="password">Password</label>
+        <div class="control has-icons-left"><input class="input" id="password" name="password" type="password" autocomplete="new-password" required><span class="icon is-left"><i class="ti ti-lock"></i></span></div>
+      </div>
+      <div class="field">
+        <label class="label" for="password_confirm">Confirm password</label>
+        <div class="control has-icons-left"><input class="input" id="password_confirm" name="password_confirm" type="password" autocomplete="new-password" required><span class="icon is-left"><i class="ti ti-lock"></i></span></div>
+      </div>
+      <div class="field mt-5"><button type="submit" class="button is-primary is-fullwidth">Create administrator</button></div>
+    </form>
+    <p class="sp-foot">© 2026 Mix · <a href="#">License (AGPL-3.0)</a> · <a href="#">Source</a> · No warranty</p>
+  </div>
+</div>