refactor(insta-lab): remove Playwright + slim Dockerfile (SP-4)

NAS에서 더 이상 카드 렌더 안 함 → Windows insta-render 워커로 완전 이전.
- card_renderer.py를 1줄 deprecation stub로 교체
- main.py의 import card_renderer 제거 + startup/shutdown hook 정리
- requirements.txt에서 playwright 삭제
- Dockerfile에서 Chromium 30+ dep 라인 + playwright install 제거 → image ~50% 감소
- test_card_renderer.py 폐기 (Windows 측 test_worker.py가 대체)
- test_main.py의 create_slate 테스트를 Redis-push 플로우에 맞게 업데이트

Plan-B-Insta Phase 3 완료.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

insta-lab/tests/test_card_renderer.py

@@ -1,59 +0,0 @@
-import os
-import tempfile
-
-import pytest
-
-from app import db as db_module
-from app import card_renderer
-
-
-@pytest.fixture
-def tmp_db_and_dirs(monkeypatch, tmp_path):
-    fd, path = tempfile.mkstemp(suffix=".db")
-    os.close(fd)
-    monkeypatch.setattr(db_module, "DB_PATH", path)
-    monkeypatch.setattr(card_renderer, "CARDS_DIR", str(tmp_path / "cards"))
-    db_module.init_db()
-    yield path
-    import gc
-    gc.collect()
-    for ext in ("", "-wal", "-shm"):
-        try:
-            os.remove(path + ext)
-        except OSError:
-            pass
-
-
-def _seed_slate() -> int:
-    return db_module.add_card_slate({
-        "keyword": "테스트",
-        "category": "economy",
-        "status": "draft",
-        "cover_copy": {"headline": "커버 헤드라인", "body": "서브카피", "accent_color": "#0F62FE"},
-        "body_copies": [{"headline": f"본문 {i+1}", "body": f"내용 {i+1}"} for i in range(8)],
-        "cta_copy": {"headline": "마무리", "body": "감사합니다", "cta": "팔로우"},
-    })
-
-
-@pytest.mark.asyncio
-async def test_render_slate_produces_ten_pngs(tmp_db_and_dirs):
-    sid = _seed_slate()
-    paths = await card_renderer.render_slate(sid)
-    assert len(paths) == 10
-    for p in paths:
-        assert os.path.exists(p)
-        assert os.path.getsize(p) > 1000  # > 1 KB sanity
-    db_module.update_slate_status(sid, "rendered")
-    assets = db_module.list_card_assets(sid)
-    assert {a["page_index"] for a in assets} == set(range(1, 11))
-
-
-@pytest.mark.asyncio
-async def test_render_falls_back_to_default_when_theme_html_missing(tmp_db_and_dirs):
-    """존재하지 않는 theme HTML 지정 시 default/card.html.j2로 폴백, 정상 PNG 생성."""
-    sid = _seed_slate()
-    paths = await card_renderer.render_slate(sid, template="ghost_theme/card.html.j2")
-    assert len(paths) == 10
-    for p in paths:
-        assert os.path.exists(p)
-        assert os.path.getsize(p) > 1000

insta-lab/tests/test_main.py

@@ -58,7 +58,11 @@ def test_keywords_listing(client):
 
 
 def test_create_slate_kicks_background_task(client, monkeypatch):
-    from app import main, card_writer, card_renderer
+    """Plan-B-Insta SP-4: 슬레이트 생성 후 Redis push → task status=processing (Windows worker 대기).
+
+    card_renderer는 NAS에서 제거됨. write_slate → Redis rpush 경로만 검증.
+    """
+    from app import main, card_writer
 
     def fake_write(keyword, category, articles=None):
         return db_module.add_card_slate({
@@ -68,24 +72,25 @@ def test_create_slate_kicks_background_task(client, monkeypatch):
             "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)]
+    async def fake_rpush(queue, payload):
+        pass  # Redis 없이도 테스트 통과
 
     monkeypatch.setattr(card_writer, "write_slate", fake_write)
-    monkeypatch.setattr(card_renderer, "render_slate", fake_render)
+    monkeypatch.setattr(main.redis_client, "rpush", fake_rpush)
 
     resp = client.post("/api/insta/slates", json={"keyword": "K", "category": "economy"})
     assert resp.status_code == 200
     task_id = resp.json()["task_id"]
-    # poll task
+    # 잠시 대기 후 폴링 — background task가 완료될 때까지
+    import time
     for _ in range(20):
         st = client.get(f"/api/insta/tasks/{task_id}").json()
-        if st["status"] in ("succeeded", "failed"):
+        if st["status"] != "pending":
             break
-    assert st["status"] == "succeeded"
+        time.sleep(0.1)
+    # Redis push 후 task는 processing 상태 (Windows worker가 rendered로 전환)
+    assert st["status"] == "processing"
+    assert st["result_id"] is not None  # slate_id가 result_id에 기록됨
     slate_id = st["result_id"]
     detail = client.get(f"/api/insta/slates/{slate_id}").json()
-    assert detail["status"] == "rendered"
-    assert len(detail["assets"]) == 10
+    assert detail["keyword"] == "K"