feat: stock screening service with value/growth strategies

- Multi-factor screening (PER, PBR, ROE, composite scoring)
- GET /results/latest endpoint with stock name joins
- REST API with health, streams, and trigger endpoints
- Redis Streams for async job processing
- Docker support with multi-stage build

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,8 @@
+__pycache__
+*.pyc
+.git
+.venv
+*.egg-info
+dist
+build
+.env