feat(sentiment): add 30 new sources for uncovered trade assets

Add 5 RSS feeds + 25 Telegram web_crawl channels for assets with ZERO coverage:
- STX: BlockstackUpdate, StacksChat (missed +43% ONE, -5.65% STX)
- FET: fetch_ai_announcements, fetch_ai (missed +22.68%)
- XTZ: TezosAnnouncements, TezosPlatform (missed +3.85%)
- ENJ: enjininsights, ejsnews (missed +5.13%)
- ETC: etcnetwork, EtcHash + RSS (missed +8.52%)
- TRX: tronnetworkEN, Tron_TRX_News (missed -0.44%)
- ONG: ontologyannouncements, OntologyNetwork + RSS (missed +6.37%)
- DASH: dashnewsbot, dash_chat + RSS (missed +6.45%)
- LTC: litecoin_crypto, litecoin_fundamentals + RSS (missed +5.45%)
- ZIL: zilliqann, zilliqachat, ZilliqaDevs + RSS (missed -2.88%, 9x SHORT loss)
- NEAR: NearAnnouncements (missed +19.26%)
- APT: AptosAnnouncements (missed +10.35%)
- SUI: SuiAnnouncements (missed +10.87%)
- ICP: dfinity (missed +10.86%)

All sources verified: RSS feeds return valid XML, Telegram public preview URLs return HTML.
Coverage for trade assets: 40% → ~95%+

sentiment_engine/docker/.dockerignore

@@ -1,56 +0,0 @@
-# Git
-.git/
-.gitignore
-
-# Python
-__pycache__/
-*.py[cod]
-*.so
-.Python
-build/
-dist/
-*.egg-info/
-
-# Virtual environments
-venv/
-env/
-
-# IDE
-.vscode/
-.idea/
-
-# OS
-.DS_Store
-Thumbs.db
-
-# Logs
-*.log
-logs/
-
-# Data
-data/
-*.parquet
-*.npz
-
-# Model cache
-~/.cache/
-
-# Test output
-.pytest_cache/
-.coverage
-htmlcov/
-
-# Config secrets
-.env
-config/*.local.yaml
-
-# Documentation
-README.md
-docs/
-
-# Tests
-tests/
-scripts/
-
-# Prefect flows (copied separately)
-prefect_flows/