优化 modelCurve 接口的调用时机，加上缓存，减少调用频率

client/src/pages/EQPage.tsx

@@ -520,6 +520,8 @@ function FreqChart({
 
 
 /* ── Main Component ── */
+const rawCurveCache = new Map<string, number[] | null>();
+
 export default function EQPage() {
   const [, setLocation] = useLocation();
   const {
@@ -610,6 +612,7 @@ export default function EQPage() {
   const [isConfirmingTarget, setIsConfirmingTarget] = useState(false);
   const [currentRawCurve, setCurrentRawCurve] = useState<number[] | null>(null);
   const [rawCurveLoading, setRawCurveLoading] = useState(false);
+  const rawCurveCacheRef = useRef(rawCurveCache);
   const allowPeqRemoteSyncRef = useRef(false);
   const lastPeqCatalogSyncKeyRef = useRef("");
   const syncingHeadphoneRef = useRef(false);
@@ -1219,6 +1222,17 @@ export default function EQPage() {
       const model = peq?.model?.trim() ?? "";
       if (!brand || !model) return null;
 
+      const cacheKey = `${brand}|${model}`;
+      if (rawCurveCacheRef.current.has(cacheKey)) {
+        const cached = rawCurveCacheRef.current.get(cacheKey);
+        if (cached) {
+          console.log("[modelCurve] cache hit", { brand, model, rawLength: cached.length });
+        } else {
+          console.log("[modelCurve] cache hit (no raw)", { brand, model });
+        }
+        return cached ?? null;
+      }
+
       const modelCurve = await getModelCurve(brand, model);
       if (modelCurve && typeof modelCurve === "object") {
         const payload = modelCurve as {
@@ -1244,6 +1258,7 @@ export default function EQPage() {
               })
           : null;
         const cleanedRaw = raw && raw.every((v) => Number.isFinite(v)) ? (raw as number[]) : null;
+        rawCurveCacheRef.current.set(cacheKey, cleanedRaw);
         console.log("[modelCurve] raw check", {
           brand,
           model,