Add config API endpoints and tests; update docs

tests/api/test_config_endpoints.py

@@ -0,0 +1,36 @@
+from fastapi.testclient import TestClient
+
+from src.server.fastapi_app import app
+from src.server.models.config import AppConfig, SchedulerConfig
+
+client = TestClient(app)
+
+
+def test_get_config_public():
+    resp = client.get("/api/config")
+    assert resp.status_code == 200
+    data = resp.json()
+    assert "name" in data
+    assert "data_dir" in data
+
+
+def test_validate_config():
+    cfg = {
+        "name": "Aniworld",
+        "data_dir": "data",
+        "scheduler": {"enabled": True, "interval_minutes": 30},
+        "logging": {"level": "INFO"},
+        "backup": {"enabled": False},
+        "other": {},
+    }
+    resp = client.post("/api/config/validate", json=cfg)
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body.get("valid") is True
+
+
+def test_update_config_unauthorized():
+    # update requires auth; without auth should be 401
+    update = {"scheduler": {"enabled": False}}
+    resp = client.put("/api/config", json=update)
+    assert resp.status_code in (401, 422)