Add CP source adapter registry with multi-worker queues and LLM extract.

Replace legacy root backend/frontend with Telegram, Crawl4AI, and VIINA adapters routed by Redis job families.

Co-authored-by: Cursor <cursoragent@cursor.com>

centers/parsing/workers/requirements-web.txt

@@ -0,0 +1,7 @@
+httpx==0.28.1
+redis==5.2.1
+beautifulsoup4==4.12.3
+lxml==5.3.0
+pydantic==2.10.3
+crawl4ai>=0.4.0,<0.7
+playwright>=1.40.0