feat: shared library for stock analysis microservices

- Common models (Stock, DailyPrice, Valuation, ScreeningResult)
- Database connectors (PostgreSQL via asyncpg, MongoDB via motor, Redis)
- Redis Streams pub/sub utilities
- Base collector class with common patterns
- Logging configuration with structlog

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

pyproject.toml

@@ -0,0 +1,25 @@
+[project]
+name = "stock-common"
+version = "0.1.0"
+description = "Shared models, config, DB/Redis utilities for stock analysis microservices"
+requires-python = ">=3.12"
+dependencies = [
+    "pydantic>=2.0",
+    "pydantic-settings>=2.0",
+    "asyncpg>=0.29",
+    "motor>=3.3",
+    "redis>=5.0",
+    "structlog>=24.0",
+    "aiohttp>=3.9",
+    "aiolimiter>=1.1",
+    "tenacity>=8.2",
+    "fastapi>=0.115",
+    "uvicorn[standard]>=0.34",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/stock_common"]