feat: interactive network map, IOC highlighting, AUP hunt selector, type filters

- NetworkMap: hunt-scoped force-directed graph with click-to-inspect popover
- NetworkMap: zoom/pan (wheel, drag, buttons), viewport transform
- NetworkMap: clickable IP/Host/Domain/URL legend chips to filter node types
- NetworkMap: brighter colors, 20% smaller nodes
- DatasetViewer: IOC columns highlighted with colored headers + cell tinting
- AUPScanner: hunt dropdown replacing dataset checkboxes, auto-select all
- Rename 'Social Media (Personal)' theme to 'Social Media' with DB migration
- Fix /api/hunts timeout: Dataset.rows lazy='noload' (was selectin cascade)
- Add OS column mapping to normalizer
- Full backend services, DB models, alembic migrations, new routes
- New components: Dashboard, HuntManager, FileUpload, NetworkMap, etc.
- Docker Compose deployment with nginx reverse proxy

backend/tests/conftest.py

@@ -0,0 +1,108 @@
+"""Shared pytest fixtures for ThreatHunt tests.
+
+Provides:
+- Async test database (in-memory SQLite)
+- Test client (httpx AsyncClient on the FastAPI app)
+- Factory functions for creating test hunts, datasets, etc.
+"""
+
+import asyncio
+import os
+from typing import AsyncGenerator
+
+import pytest
+import pytest_asyncio
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import sessionmaker
+
+# Force test database
+os.environ["TH_DATABASE_URL"] = "sqlite+aiosqlite:///:memory:"
+os.environ["TH_JWT_SECRET"] = "test-secret-key-for-tests"
+
+from app.db.engine import Base, get_db
+from app.main import app
+
+
+# ── Database fixtures ─────────────────────────────────────────────────
+
+@pytest_asyncio.fixture(scope="session")
+def event_loop():
+    """Create an event loop for the test session."""
+    loop = asyncio.new_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest_asyncio.fixture(scope="session")
+async def test_engine():
+    """Create test database engine."""
+    engine = create_async_engine(
+        "sqlite+aiosqlite:///:memory:",
+        echo=False,
+    )
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    yield engine
+    await engine.dispose()
+
+
+@pytest_asyncio.fixture
+async def db_session(test_engine) -> AsyncGenerator[AsyncSession, None]:
+    """Create a fresh database session for each test."""
+    async_session = sessionmaker(
+        test_engine, class_=AsyncSession, expire_on_commit=False
+    )
+    async with async_session() as session:
+        yield session
+        await session.rollback()
+
+
+@pytest_asyncio.fixture
+async def client(db_session) -> AsyncGenerator[AsyncClient, None]:
+    """Create an async test client with overridden DB dependency."""
+
+    async def _override_get_db():
+        yield db_session
+
+    app.dependency_overrides[get_db] = _override_get_db
+
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as ac:
+        yield ac
+
+    app.dependency_overrides.clear()
+
+
+# ── Factory helpers ───────────────────────────────────────────────────
+
+def make_csv_bytes(
+    columns: list[str],
+    rows: list[list[str]],
+    delimiter: str = ",",
+) -> bytes:
+    """Create CSV content as bytes for upload tests."""
+    lines = [delimiter.join(columns)]
+    for row in rows:
+        lines.append(delimiter.join(str(v) for v in row))
+    return "\n".join(lines).encode("utf-8")
+
+
+SAMPLE_CSV = make_csv_bytes(
+    ["timestamp", "hostname", "src_ip", "dst_ip", "process_name", "command_line"],
+    [
+        ["2025-01-15T10:30:00Z", "DESKTOP-ABC", "192.168.1.100", "10.0.0.50", "cmd.exe", "cmd /c whoami"],
+        ["2025-01-15T10:31:00Z", "DESKTOP-ABC", "192.168.1.100", "10.0.0.51", "powershell.exe", "powershell -enc SGVsbG8="],
+        ["2025-01-15T10:32:00Z", "DESKTOP-XYZ", "192.168.1.101", "8.8.8.8", "chrome.exe", "chrome.exe --no-sandbox"],
+        ["2025-01-15T10:33:00Z", "DESKTOP-ABC", "192.168.1.100", "203.0.113.5", "svchost.exe", "svchost.exe -k netsvcs"],
+        ["2025-01-15T10:34:00Z", "SERVER-DC01", "10.0.0.1", "10.0.0.50", "lsass.exe", "lsass.exe"],
+    ],
+)
+
+SAMPLE_HASH_CSV = make_csv_bytes(
+    ["filename", "md5", "sha256", "size"],
+    [
+        ["malware.exe", "d41d8cd98f00b204e9800998ecf8427e", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "1024"],
+        ["benign.dll", "098f6bcd4621d373cade4e832627b4f6", "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8", "2048"],
+    ],
+)