chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

backend/app/models/__init__.py

@@ -0,0 +1,28 @@
+from app.models.entities import (
+    AppSetting,
+    AuditLog,
+    Home,
+    HomeMembership,
+    InvitationToken,
+    MailSetting,
+    Notification,
+    PasswordResetToken,
+    Product,
+    ShoppingItem,
+    User,
+)
+
+__all__ = [
+    "AppSetting",
+    "AuditLog",
+    "Home",
+    "HomeMembership",
+    "InvitationToken",
+    "MailSetting",
+    "Notification",
+    "PasswordResetToken",
+    "Product",
+    "ShoppingItem",
+    "User",
+]
+