feat(01-01): add test scaffold, health and static asset tests, fix deprecated APIs

- requirements-dev.txt with pytest and httpx
- tests/conftest.py: client and tmp_data_dir fixtures
- tests/test_health.py: GET /health returns 200 with {"status": "ok"}
- tests/test_static.py: no CDN URLs in templates, dashboard returns 200
- Fix imptune/api/pages.py: use request= kwarg in TemplateResponse (Starlette compat)
- Fix imptune/main.py: replace deprecated on_event with asynccontextmanager lifespan

tests/conftest.py

@@ -0,0 +1,26 @@
+import os
+
+import pytest
+from fastapi.testclient import TestClient
+
+
+@pytest.fixture
+def client(tmp_data_dir):
+    from imptune.main import app
+
+    return TestClient(app)
+
+
+@pytest.fixture
+def tmp_data_dir(tmp_path, monkeypatch):
+    """Set DATA_DIR to a temp directory so tests don't write to /data."""
+    data_dir = tmp_path / "data"
+    data_dir.mkdir()
+    monkeypatch.setenv("DATA_DIR", str(data_dir))
+    # Patch config module so the app uses the temp dir
+    import imptune.config as cfg
+
+    cfg.DATA_DIR = str(data_dir)
+    cfg.DB_PATH = str(data_dir / "imptune.db")
+    cfg.DRIVERS_DIR = str(data_dir / "drivers")
+    return data_dir

tests/test_health.py

@@ -0,0 +1,5 @@
+def test_health_returns_200(client):
+    """GET /health returns 200 with {"status": "ok"}."""
+    response = client.get("/health")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}

tests/test_static.py

@@ -0,0 +1,37 @@
+import re
+from pathlib import Path
+
+
+CDN_PATTERNS = re.compile(
+    r"(cdn\.jsdelivr\.net|unpkg\.com|cdnjs\.com)",
+    re.IGNORECASE,
+)
+
+# Matches href="https://..." or src="https://..."
+EXTERNAL_URL_PATTERN = re.compile(
+    r'(?:href|src)=["\']https?://',
+    re.IGNORECASE,
+)
+
+
+def test_no_cdn_urls_in_templates():
+    """All .html templates use /static/ paths only — no CDN URLs in href/src attributes."""
+    templates_dir = Path(__file__).parent.parent / "imptune" / "templates"
+    html_files = list(templates_dir.glob("**/*.html"))
+    assert html_files, "No HTML templates found — check templates directory path"
+
+    violations = []
+    for html_file in html_files:
+        content = html_file.read_text(encoding="utf-8")
+        if CDN_PATTERNS.search(content):
+            violations.append(f"{html_file.name}: contains CDN domain reference")
+        if EXTERNAL_URL_PATTERN.search(content):
+            violations.append(f"{html_file.name}: contains external https:// in href/src")
+
+    assert not violations, "CDN/external URL violations found:\n" + "\n".join(violations)
+
+
+def test_dashboard_returns_200(client):
+    """GET / returns 200 (dashboard page)."""
+    response = client.get("/")
+    assert response.status_code == 200