Enhance DeviceContext and LuxsinAPI to support new PEQ apply functionality; update locale files for English and Chinese to include new UI strings for applying and saving PEQ settings. Refactor AudioPage and EQPage to integrate boot sound management and improve state handling.

client/src/locales/data-zh.json

@@ -219,9 +219,14 @@
       "errFilterNumbers": "Filter {{no}} 的数值无效",
       "errFilterAll": "Filter 1–10 必须全部提供",
       "chartCopyTo": "复制到 {{mode}}",
-      "chartLoadToDevice": "加载至设备",
+      "chartApplyB": "应用 B",
+      "chartSaveB": "另存 B",
+      "saveBTitle": "另存 B",
       "toastChartCopied": "已复制到 {{mode}}",
-      "toastChartLoadedDevice": "已加载至设备"
+      "toastApplyBSuccess": "已将 B 曲线应用到 A",
+      "toastApplyBFail": "应用 B 失败",
+      "toastSaveBOk": "已另存 B 预设",
+      "toastSaveBFail": "另存 B 失败"
     }
   },
   "dac": {
@@ -250,7 +255,22 @@
       ]
     },
     "volumeStep": "音量幅度",
-    "bootVolume": "开机音量",
+    "bootVolume": {
+      "label": "开机音量",
+      "options": [
+        { "index": 0, "label": "默认" },
+        { "index": 1, "label": "-5dB" },
+        { "index": 2, "label": "-10dB" },
+        { "index": 3, "label": "-15dB" },
+        { "index": 4, "label": "-20dB" },
+        { "index": 5, "label": "-25dB" },
+        { "index": 6, "label": "-30dB" },
+        { "index": 7, "label": "-35dB" },
+        { "index": 8, "label": "-40dB" },
+        { "index": 9, "label": "-45dB" },
+        { "index": 10, "label": "-50dB" }
+      ]
+    },
     "xlr": {
       "label": "XLR端口极性",
       "options": [