feat: initial FastAPI boilerplate setup

Set up Webber - multi-agent AI development system with:

- Domain-based project structure (src/domains/, src/shared/)
- BaseController pattern with lazy router instantiation
- Pydantic Settings configuration with env file support
- Logger decorator with temporal benchmarking and trace IDs
- UserProvider singleton for request-scoped context
- Custom exception hierarchy
- Health endpoints (/, /health)

Dependencies (CVE checked 2026-01-09):
- FastAPI 0.128.0, Starlette 0.50.0, Uvicorn 0.40.0
- Pydantic 2.12.4, PydanticAI 1.40.0
- All packages at latest safe versions

Placeholder domains for future implementation:
- agents/ (explore, plan, task)
- tools/ (file, shell, search)
- auth/ (tatlock integration)

Port: 8086 (per CONTAINERS.md allocation)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,34 @@
+"""
+Pytest configuration and fixtures.
+"""
+import pytest
+from httpx import AsyncClient, ASGITransport
+
+from src.main import app
+
+
+@pytest.fixture
+def anyio_backend():
+    """Use asyncio for async tests."""
+    return "asyncio"
+
+
+@pytest.fixture
+async def client():
+    """Async HTTP client for testing."""
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="http://test"
+    ) as ac:
+        yield ac
+
+
+@pytest.fixture
+async def auth_client():
+    """Async HTTP client with API key for authenticated requests."""
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="http://test",
+        headers={"X-API-Key": "test-api-key"}
+    ) as ac:
+        yield ac

tests/test_health.py

@@ -0,0 +1,29 @@
+"""
+Health endpoint tests.
+"""
+import pytest
+
+
+@pytest.mark.anyio
+async def test_root(client):
+    """Test root endpoint returns service info."""
+    response = await client.get("/")
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "Webber" in data["service"]
+    assert data["status"] == "healthy"
+    assert "version" in data
+    assert data["docs"] == "/docs"
+
+
+@pytest.mark.anyio
+async def test_health_check(client):
+    """Test health check endpoint."""
+    response = await client.get("/health")
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["status"] == "healthy"
+    assert "Webber" in data["service"]
+    assert "version" in data