Add HTTP API contract fixtures

tests/fixtures/http_api/config_response.json

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+{
+  "device_name": "Cargo Controller",
+  "relays": [
+    {
+      "id": "relay_1",
+      "name": "Aux Power",
+      "pin": 16,
+      "enabled": true
+    },
+    {
+      "id": "relay_2",
+      "name": "Fridge",
+      "pin": 17,
+      "enabled": true
+    }
+  ],
+  "bms": {
+    "enabled": true,
+    "name": "House Battery",
+    "address": "aa:bb:cc:dd:ee:ff",
+    "address_type": "public"
+  },
+  "temperature_sensors": [
+    {
+      "id": "temp_1",
+      "name": "Cabin",
+      "address": "28ff001122334455",
+      "enabled": true
+    }
+  ]
+}

tests/fixtures/http_api/error_response.json

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+{
+  "ok": false,
+  "error": "invalid_json"
+}

tests/fixtures/http_api/relay_set_request.json

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+{
+  "id": "relay_1",
+  "state": true
+}

tests/fixtures/http_api/relay_set_response.json

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+{
+  "type": "relay_response",
+  "ok": true,
+  "id": "relay_1",
+  "state": true
+}

tests/fixtures/http_api/status_response.json

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+{
+  "type": "status_response",
+  "timestamp": 123456,
+  "battery": {
+    "source": "jbd_bms",
+    "connected": true,
+    "soc": 70,
+    "voltage": 13.34,
+    "current": -5.2,
+    "remaining_ah": 104.8,
+    "capacity_ah": 150.0,
+    "runtime_hours": 20.15,
+    "temperature_f": 76.5,
+    "cycle_count": 3,
+    "cell_count": 4,
+    "ntc_count": 2,
+    "cell_voltages": [3.334, 3.333, 3.334, 3.333],
+    "cell_min_voltage": 3.333,
+    "cell_max_voltage": 3.334,
+    "cell_delta_mv": 1,
+    "cells_valid": true
+  },
+  "temps": [
+    {
+      "id": "temp_1",
+      "name": "Cabin",
+      "enabled": true,
+      "weather": false,
+      "online": true,
+      "temperature_f": 72.4
+    }
+  ],
+  "relays": [
+    {
+      "id": "relay_1",
+      "name": "Aux Power",
+      "pin": 16,
+      "enabled": true,
+      "state": false
+    },
+    {
+      "id": "relay_2",
+      "name": "Fridge",
+      "pin": 17,
+      "enabled": true,
+      "state": true
+    }
+  ],
+  "vehicle": {
+    "ignition_on": false
+  },
+  "network": {
+    "wifi_enabled": true,
+    "uart_connected": true,
+    "ap_enabled": true,
+    "ap_ip": "192.168.4.1",
+    "sta_enabled": true,
+    "sta_connected": false,
+    "sta_ssid": "",
+    "sta_ip": "",
+    "saved_network_count": 1,
+    "saved_networks": [
+      {
+        "index": 1,
+        "ssid": "Starlink",
+        "priority": 1,
+        "active": false
+      }
+    ]
+  },
+  "alarms": {
+    "low_soc": false,
+    "critical_soc": false,
+    "low_voltage": false,
+    "high_battery_temp": false,
+    "cell_imbalance": false,
+    "bms_disconnected": false
+  },
+  "system": {
+    "firmware_name": "overland-controller",
+    "firmware_version": "0.4.0",
+    "build_date": "Jun 07 2026",
+    "build_time": "12:00:00",
+    "uptime_seconds": 42
+  },
+  "config": {
+    "device_name": "Cargo Controller",
+    "relays": [
+      {
+        "id": "relay_1",
+        "name": "Aux Power",
+        "pin": 16,
+        "enabled": true
+      }
+    ],
+    "bms": {
+      "enabled": true,
+      "name": "House Battery",
+      "address": "aa:bb:cc:dd:ee:ff",
+      "address_type": "public"
+    },
+    "temperature_sensors": [
+      {
+        "id": "temp_1",
+        "name": "Cabin",
+        "address": "28ff001122334455",
+        "enabled": true,
+        "weather": false
+      }
+    ]
+  }
+}

tests/fixtures/http_api/temp_assign_request.json

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+{
+  "id": "temp_1",
+  "index": 1
+}

tests/fixtures/http_api/temp_assign_response.json

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+{
+  "device_name": "Cargo Controller",
+  "relays": [],
+  "bms": {
+    "enabled": true,
+    "name": "House Battery",
+    "address": "aa:bb:cc:dd:ee:ff",
+    "address_type": "public"
+  },
+  "temperature_sensors": [
+    {
+      "id": "temp_1",
+      "name": "Cabin",
+      "address": "28ff001122334455",
+      "enabled": true
+    }
+  ]
+}

tests/fixtures/http_api/temp_clear_request.json

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+{
+  "id": "temp_1"
+}

tests/fixtures/http_api/temp_clear_response.json

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+{
+  "device_name": "Cargo Controller",
+  "relays": [],
+  "bms": {
+    "enabled": true,
+    "name": "House Battery",
+    "address": "aa:bb:cc:dd:ee:ff",
+    "address_type": "public"
+  },
+  "temperature_sensors": [
+    {
+      "id": "temp_1",
+      "name": "Cabin",
+      "address": "",
+      "enabled": false
+    }
+  ]
+}

tests/fixtures/http_api/temp_scan_response.json

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+{
+  "type": "temp_scan_response",
+  "ok": true,
+  "devices": [
+    {
+      "index": 1,
+      "address": "28ff001122334455"
+    }
+  ]
+}

tests/fixtures/http_api/wifi_config_request.json

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+{
+  "networks": [
+    {
+      "ssid": "Starlink",
+      "password": "example-password",
+      "priority": 1
+    }
+  ]
+}

tests/fixtures/http_api/wifi_config_response.json

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+{
+  "type": "wifi_config_response",
+  "ok": true,
+  "wifi": {
+    "ap_enabled": true,
+    "sta_enabled": true,
+    "network_count": 1,
+    "active_ssid": "",
+    "sta_connected": false,
+    "ap_ip": "192.168.4.1",
+    "sta_ip": "",
+    "networks": [
+      {
+        "index": 1,
+        "ssid": "Starlink",
+        "priority": 1,
+        "password_set": true
+      }
+    ]
+  }
+}