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/routers/profile/__init__.py

@@ -1,20 +1,16 @@
 # retoor <retoor@molodetz.nl>
 
-from fastapi import APIRouter
-
 from devplacepy.routers.profile import (
     ai_correction,
     ai_modifier,
     avatar,
     customization,
-    index,
     notifications,
     telegram,
 )
+from devplacepy.routers.profile.index import router
 from devplacepy.routers.profile.usage import _ai_quota
 
-router = APIRouter()
-router.include_router(index.router)
 router.include_router(customization.router)
 router.include_router(notifications.router)
 router.include_router(ai_correction.router)