feat(insta-lab): main.py FastAPI endpoints + BackgroundTasks

13 REST endpoints covering health, status, news, keywords, slates,
tasks, and prompt templates. All background functions are async def
so FastAPI awaits them without asyncio.run conflicts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

insta-lab/tests/test_main.py

@@ -0,0 +1,91 @@
+import os
+import tempfile
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app import db as db_module
+
+
+@pytest.fixture
+def client(monkeypatch):
+    fd, path = tempfile.mkstemp(suffix=".db")
+    os.close(fd)
+    monkeypatch.setattr(db_module, "DB_PATH", path)
+    db_module.init_db()
+    from app import main
+    monkeypatch.setattr(main, "DB_PATH", path)
+    with TestClient(main.app) as c:
+        yield c
+    import gc
+    gc.collect()
+    for ext in ("", "-wal", "-shm"):
+        try:
+            os.remove(path + ext)
+        except OSError:
+            pass
+
+
+def test_health(client):
+    resp = client.get("/health")
+    assert resp.status_code == 200
+    assert resp.json()["ok"] is True
+
+
+def test_status_endpoint(client):
+    resp = client.get("/api/insta/status")
+    assert resp.status_code == 200
+    j = resp.json()
+    assert "naver_api" in j and "anthropic_api" in j
+
+
+def test_news_articles_listing(client):
+    db_module.add_news_article({
+        "category": "economy", "title": "T1", "link": "https://x/1", "summary": "S",
+    })
+    resp = client.get("/api/insta/news/articles?category=economy&days=7")
+    assert resp.status_code == 200
+    assert len(resp.json()["items"]) == 1
+
+
+def test_keywords_listing(client):
+    db_module.add_trending_keyword({
+        "keyword": "K", "category": "economy", "score": 0.5, "articles_count": 3,
+    })
+    resp = client.get("/api/insta/keywords?category=economy")
+    assert resp.status_code == 200
+    assert resp.json()["items"][0]["keyword"] == "K"
+
+
+def test_create_slate_kicks_background_task(client, monkeypatch):
+    from app import main, card_writer, card_renderer
+
+    def fake_write(keyword, category, articles=None):
+        return db_module.add_card_slate({
+            "keyword": keyword, "category": category, "status": "draft",
+            "cover_copy": {"headline": "H", "body": "B", "accent_color": "#000"},
+            "body_copies": [{"headline": f"h{i}", "body": f"b{i}"} for i in range(8)],
+            "cta_copy": {"headline": "C", "body": "B", "cta": "F"},
+        })
+
+    async def fake_render(slate_id, template="default/card.html.j2"):
+        for i in range(1, 11):
+            db_module.add_card_asset(slate_id, i, f"/tmp/{slate_id}_{i}.png", "h")
+        return [f"/tmp/{slate_id}_{i}.png" for i in range(1, 11)]
+
+    monkeypatch.setattr(card_writer, "write_slate", fake_write)
+    monkeypatch.setattr(card_renderer, "render_slate", fake_render)
+
+    resp = client.post("/api/insta/slates", json={"keyword": "K", "category": "economy"})
+    assert resp.status_code == 200
+    task_id = resp.json()["task_id"]
+    # poll task
+    for _ in range(20):
+        st = client.get(f"/api/insta/tasks/{task_id}").json()
+        if st["status"] in ("succeeded", "failed"):
+            break
+    assert st["status"] == "succeeded"
+    slate_id = st["result_id"]
+    detail = client.get(f"/api/insta/slates/{slate_id}").json()
+    assert detail["status"] == "rendered"
+    assert len(detail["assets"]) == 10