fix(v1.7.1): wordmark image on every beep + reply, restore updater

- Render the Beep wordmark bottom-right of every beep AND reply, with the
  delete button furthest right (was: wordmark right of delete, missing on
  replies, and duplicated after the replies block).
- Draw the wordmark as crisp inline SVG via beep_post_wordmark() (filterable);
  the bundled beep-wordmark.png assets are corrupted. Readable on dark theme.
- Restore class-updater.php (self-hosted Gitea updates) deleted in the
  master->main consolidation; re-wire it in beep.php.
- Remove stray includes/class-shortcode.php.bak.
- Bump to 1.7.1; sync readme.txt stable tag + changelog.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/beep.css

@@ -1054,8 +1054,7 @@
 /* Bottom bar: wordmark left, delete right */
 /* Bottom bar: wordmark left, delete right */
 /* Bottom bar: delete left, wordmark right (blue, large) */
-/* Bottom bar: delete left, wordmark right (blue) */
-/* Bottom bar: delete left, wordmark text right */
+/* Bottom bar: wordmark on the left, delete furthest right */
 .beep-embed .beep-bottom-bar {
   display: flex;
   align-items: center;
@@ -1063,15 +1062,20 @@
   gap: 8px;
   margin-top: 4px;
 }
-.beep-embed .beep-wordmark {
-  font-size: 16px;
-  font-weight: 800;
-  color: #0064cd;
-  opacity: 0.5;
-  letter-spacing: -0.5px;
+/* Brand wordmark (inline SVG, inherits colour via currentColor) */
+.beep-embed .beep-post-wordmark {
+  color: var(--beep-accent);
+  opacity: 0.55;
+  flex: 0 0 auto;
+  height: 16px;
+  width: auto;
   transition: opacity 0.15s ease;
   user-select: none;
 }
-.beep-embed .beep-post:hover .beep-wordmark {
-  opacity: 1;
+.beep-embed .beep-bottom-bar-reply .beep-post-wordmark {
+  height: 13px;
+}
+.beep-embed .beep-post:hover .beep-post-wordmark,
+.beep-embed .beep-reply:hover .beep-post-wordmark {
+  opacity: 0.9;
 }