Add project scaffolding and documentation

Add .env.example with configuration for database, Redis, security, SMTP, workers, and plugins. Add .gitignore for Python, Node.js, Next.js, Docker volumes, and IDE files. Add MIT License. Update README.md with feature overview, quick start guide, architecture description, plugin system documentation, security details, backup/restore instructions, and developer setup. Add Alembic configuration files and placeholder directories for API, web, worker, and plugin components

apps/api/tests/conftest.py

@@ -0,0 +1,39 @@
+import pytest
+import pytest_asyncio
+from fastapi.testclient import TestClient
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import sessionmaker
+
+from apps.api.src.database import Base, get_db
+from apps.api.src.main import app
+
+TEST_DATABASE_URL = "postgresql+asyncpg://test:test@localhost:5432/nexadash_test"
+
+engine = create_async_engine(TEST_DATABASE_URL, echo=False, future=True)
+TestingSessionLocal = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+@pytest_asyncio.fixture(scope="session", autouse=True)
+async def prepare_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    yield
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+
+
+@pytest_asyncio.fixture
+async def db():
+    async with TestingSessionLocal() as session:
+        yield session
+        await session.rollback()
+
+
+@pytest.fixture
+def client(db):
+    async def override_get_db():
+        yield db
+
+    app.dependency_overrides[get_db] = override_get_db
+    yield TestClient(app)
+    app.dependency_overrides.clear()