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/tests/test_security.py

@@ -0,0 +1,14 @@
+from app.core.security import hash_password, hash_token, verify_password
+
+
+def test_password_hash_roundtrip() -> None:
+    password_hash = hash_password("a-very-long-password")
+    assert password_hash != "a-very-long-password"
+    assert verify_password("a-very-long-password", password_hash)
+    assert not verify_password("wrong-password", password_hash)
+
+
+def test_tokens_are_hashed() -> None:
+    assert hash_token("secret") == hash_token("secret")
+    assert hash_token("secret") != "secret"
+