feat: Implement features and continuously optimize the proxy service

- Settings page UI
- Persist settings data
- Proxy server fixes & optimizations:
  - Fixed download latency caused by Range Seek
  - Improved cache stability
  - Implemented a dual-threading model to ensure smooth playback
- Optimized styles for the homepage TopBar and SideBar
- Added theme switching functionality
- Added theme color customization feature

electron/settingsStore.ts

@@ -0,0 +1,65 @@
+import fs from 'fs';
+import path from 'path';
+import { app } from 'electron';
+
+export interface AppSettings {
+    // Cache
+    persistCache: boolean;
+
+    // Appearance
+    theme: 'dark' | 'light';
+    accentColor: string;
+}
+
+const DEFAULT_SETTINGS: AppSettings = {
+    persistCache: true,
+    theme: 'dark',
+    accentColor: '#ec4141', // Default red
+};
+
+let settingsCache: AppSettings | null = null;
+
+function getSettingsPath(): string {
+    return path.join(app.getPath('userData'), 'settings.json');
+}
+
+export function loadSettings(): AppSettings {
+    if (settingsCache) return settingsCache;
+
+    const settingsPath = getSettingsPath();
+    try {
+        if (fs.existsSync(settingsPath)) {
+            const data = fs.readFileSync(settingsPath, 'utf-8');
+            settingsCache = { ...DEFAULT_SETTINGS, ...JSON.parse(data) };
+            console.log('[Settings] Loaded from disk:', settingsCache);
+            return settingsCache!;
+        }
+    } catch (e) {
+        console.error('[Settings] Failed to load settings:', e);
+    }
+
+    settingsCache = { ...DEFAULT_SETTINGS };
+    return settingsCache;
+}
+
+export function saveSettings(settings: Partial<AppSettings>): AppSettings {
+    settingsCache = { ...loadSettings(), ...settings };
+
+    const settingsPath = getSettingsPath();
+    try {
+        fs.writeFileSync(settingsPath, JSON.stringify(settingsCache, null, 2));
+        console.log('[Settings] Saved to disk:', settingsCache);
+    } catch (e) {
+        console.error('[Settings] Failed to save settings:', e);
+    }
+
+    return settingsCache;
+}
+
+export function getSetting<K extends keyof AppSettings>(key: K): AppSettings[K] {
+    return loadSettings()[key];
+}
+
+export function setSetting<K extends keyof AppSettings>(key: K, value: AppSettings[K]): void {
+    saveSettings({ [key]: value });
+}