feat: add authenticated my-profile endpoint and clean breadcrumb markdown in SEO context

- Add GET /profile route returning own profile page with tab support, backed by new my_profile_page handler in profile/index.py and documented in docs_api.py
- Introduce _clean_breadcrumbs helper in seo.py that strips markdown from breadcrumb names before passing to schema generation
- Skip data-confirm modal for elements with data-auto-submit attribute in ModalManager.js
- Guard PushManager subscription against missing userUid and capture it from document body dataset
- Switch profile bio template from render_title to render_content and use div instead of span for proper block rendering

devplacepy/services/devii/actions/catalog.py

@@ -684,6 +684,13 @@ ACTIONS: tuple[Action, ...] = (
         summary="Search for users by name",
         params=(query("q", "Search query."),),
     ),
+    Action(
+        name="my_profile",
+        method="GET",
+        path="/profile",
+        summary="View the current user's own profile",
+        params=(query("tab", "Profile tab."),),
+    ),
     Action(
         name="view_profile",
         method="GET",