feat(v5.5.0): Embeds & Media riche - universal embeds, bookmark cards, lightbox, inline previews, cover & icon

- embeds.py: provider detection/rewrite (YouTube, Vimeo, Figma, Maps, Docs,
  Loom, CodePen, Miro, Spotify, SoundCloud, Twitch, X/Twitter, Pinterest,
  Office) + resolve_embed/inline_kind/provider; POST /board/api/embed/resolve
- editor resolves pasted URLs and caches embed_src (persisted); renderer,
  public pages and MD/HTML/PDF exports prefer embed_src
- og_fetcher.py: robust meta parsing (any attribute order), favicon,
  injectable transport, network-safe fallback
- image lightbox with keyboard nav (arrows/Esc) in editor and public pages
- inline PDF/video/audio previews
- cover (URL or upload) & page icon endpoints
- fix broken editor API paths (/api/pages -> /board/api/pages) for cover,
  icon, versions, backlinks, import, move and OG metadata
- 47 tests in tests/test_v55.py; full suite 444 green; ruff clean
- version 5.11.2

app/main.py

@@ -85,7 +85,7 @@ async def lifespan(_app: FastAPI):
     from app.services.trash import trash_purge_scheduler
     trash_task = asyncio.create_task(trash_purge_scheduler())
 
-    logger.info("FlowDeck v5.11.1 started on port %d", settings.app_port)
+    logger.info("FlowDeck v5.11.2 started on port %d", settings.app_port)
     try:
         yield
     finally:
@@ -100,7 +100,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="5.11.1",
+    version="5.11.2",
     docs_url="/docs" if settings.log_level == "DEBUG" else None,
     redoc_url=None,
     lifespan=lifespan,