feat: add initial frontend setup with styles, types, and testing framework

- Created a global CSS file for styling the frontend with responsive design.
- Introduced TypeScript types for various entities including Research, Alpha, and Account.
- Implemented Playwright tests for account management and data synchronization workflows.
- Configured TypeScript with strict settings and included necessary libraries.
- Set up Vite as the build tool with React plugin and API proxy configuration.
- Added a Python script to initialize environment variables securely.

backend/tests/conftest.py

@@ -0,0 +1,71 @@
+import httpx
+import pytest
+from cryptography.fernet import Fernet
+
+from app.config import Settings
+from app.main import create_app
+from app.models import Base
+from app.worldquant import WqClient
+
+ADMIN_PASSWORD = "test-admin-password-only"
+
+
+@pytest.fixture
+def settings(tmp_path):
+    return Settings(
+        _env_file=None,
+        database_url=f"sqlite+aiosqlite:///{tmp_path}/test.db",
+        admin_password=ADMIN_PASSWORD,
+        encryption_key=Fernet.generate_key().decode(),
+        enable_runner=False,
+        public_origin="http://testserver",
+    )
+
+
+@pytest.fixture
+async def app(settings):
+    def unexpected_request(request):
+        raise AssertionError("Unit tests must never access the real platform")
+
+    application = create_app(settings, WqClient(settings, transport=httpx.MockTransport(unexpected_request)))
+    async with application.state.engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    async with application.router.lifespan_context(application):
+        yield application
+
+
+@pytest.fixture
+async def client(app):
+    async with httpx.AsyncClient(
+        transport=httpx.ASGITransport(app=app), base_url="http://testserver", headers={"X-WQ-Request": "1"}
+    ) as client:
+        yield client
+
+
+@pytest.fixture
+async def logged_in(client):
+    response = await client.post("/api/v1/auth/login", json={"username": "admin", "password": ADMIN_PASSWORD})
+    assert response.status_code == 200
+    return client
+
+
+def alpha(alpha_id="alpha1", **changes):
+    raw = {
+        "id": alpha_id,
+        "name": "Reversal",
+        "type": "REGULAR",
+        "stage": "IS",
+        "status": "UNSUBMITTED",
+        "hidden": False,
+        "regular": {"code": "-rank(ts_delta(close, 5))"},
+        "settings": {"region": "USA", "universe": "TOP3000", "language": "FASTEXPR", "delay": 1},
+        "is": {
+            "sharpe": 1.5,
+            "fitness": 0.8,
+            "turnover": 0.2,
+            "returns": 0.04,
+            "checks": [{"name": "LOW_SHARPE", "result": "FAIL", "value": 1.5, "limit": 1.58}],
+        },
+        "dateCreated": "2025-01-01T00:00:00Z",
+    }
+    return {**raw, **changes}