test(translation): API endpoint tests for status + run (#143 step 6)

/settings/translation/status defaults (off → no health call) + /run 400-when-
unconfigured + 202-when-configured (monkeypatched .delay). requests is already a
backend dep, so no requirements/ci-requirements change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

tests/test_api_settings.py

@@ -53,6 +53,36 @@ async def test_translation_settings_defaults_and_patch(client):
         "/api/settings/import", json={"interpreter_base_url": 123})).status_code == 400
 
 
+@pytest.mark.asyncio
+async def test_translation_status_defaults(client):
+    # Off + no URL → no network health call, healthy False (#143).
+    body = await (await client.get("/api/settings/translation/status")).get_json()
+    assert body["enabled"] is False
+    assert body["base_url_set"] is False
+    assert body["healthy"] is False
+    assert "untranslated_count" in body
+
+
+@pytest.mark.asyncio
+async def test_translation_run_requires_config(client):
+    resp = await client.post("/api/settings/translation/run")
+    assert resp.status_code == 400   # disabled / no base URL
+
+
+@pytest.mark.asyncio
+async def test_translation_run_enqueues_when_configured(client, monkeypatch):
+    monkeypatch.setattr(
+        "backend.app.tasks.translation.translate_posts.delay",
+        lambda *a, **k: type("R", (), {"id": "t1"})(),
+    )
+    await client.patch("/api/settings/import", json={
+        "translation_enabled": True, "interpreter_base_url": "http://i.lan",
+    })
+    resp = await client.post("/api/settings/translation/run")
+    assert resp.status_code == 202
+    assert (await resp.get_json())["celery_task_id"] == "t1"
+
+
 @pytest.mark.asyncio
 async def test_patch_rejects_non_object(client):
     resp = await client.patch("/api/settings/import", json=[1, 2, 3])