Add maintenance API endpoints

tests/test_http_api_contract.py

@@ -39,7 +39,11 @@ def test_firmware_registers_current_http_contract_routes():
 
     expected_routes = {
         ("/api/v1/status", "ANY"),
+        ("/api/v1/health", "HTTP_GET"),
+        ("/api/v1/capabilities", "HTTP_GET"),
         ("/api/v1/config", "HTTP_GET"),
+        ("/api/v1/config/export", "HTTP_GET"),
+        ("/api/v1/config/import", "HTTP_POST"),
         ("/api/v1/relay/set", "HTTP_POST"),
         ("/api/v1/config/wifi", "HTTP_GET"),
         ("/api/v1/config/wifi", "HTTP_POST"),
@@ -155,10 +159,42 @@ def test_status_fixture_matches_dashboard_contract_shape():
 def test_config_fixture_matches_current_config_response_shape():
     payload = load_fixture("config_response.json")
 
-    assert_keys(payload, ["device_name", "relays", "bms", "temperature_sensors"])
+    assert_keys(payload, [
+        "device_name",
+        "relays",
+        "bms",
+        "temperature_sensor_count",
+        "temperature_sensors",
+    ])
     assert_keys(payload["relays"][0], ["id", "name", "pin", "enabled"])
     assert_keys(payload["bms"], ["enabled", "name", "address", "address_type"])
-    assert_keys(payload["temperature_sensors"][0], ["id", "name", "address", "enabled"])
+    assert_keys(payload["temperature_sensors"][0], [
+        "id",
+        "name",
+        "address",
+        "enabled",
+        "weather",
+    ])
+
+
+def test_health_and_capabilities_contracts_are_registered():
+    source = firmware_source()
+
+    assert '"health_response"' in source
+    assert '"capabilities_response"' in source
+    assert '"GET /api/v1/health"' in source
+    assert '"GET /api/v1/capabilities"' in source
+    assert '"config_backup_restore"' in source
+
+
+def test_config_backup_restore_contract_is_registered():
+    source = firmware_source()
+
+    assert 'API_V1("/config/export")' in source
+    assert 'API_V1("/config/import")' in source
+    assert '"config_export_response"' in source
+    assert '"password"' in source
+    assert '"invalid_config"' in source
 
 
 def test_relay_set_contract_fixtures_and_firmware_errors():
@@ -236,6 +272,7 @@ def test_http_error_fixture_and_known_error_codes_are_stable():
 
     for error_code in [
         "invalid_json",
+        "invalid_config",
         "unknown_relay",
         "unknown_temp_sensor",
         "invalid_temp_selection",