Add Reddit monitoring bot — backend, frontend, and Docker config

Python/FastAPI backend with PostgreSQL for collecting Reddit data via
public .json endpoints. React/Vite dashboard for analytics. Docker Compose
setup with API and worker services connecting to shared PostgreSQL.

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

.gitignore

@@ -0,0 +1,31 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+dist/
+build/
+*.egg
+.venv/
+venv/
+
+# Environment
+.env
+
+# IDE
+.vscode/
+.idea/
+
+# Node
+node_modules/
+frontend/dist/
+
+# Docker
+.docker/
+
+# Alembic
+alembic/versions/__pycache__/
+
+# OS
+.DS_Store
+Thumbs.db