feat: 实现功能&优化

- 底部播放栏
- MediaSession
- 插件系统&存储位置
- URL缓存机制
- 整理项目结构

src/renderer/styles/main.css

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+@import 'variables.css';
+
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: var(--font-family-base);
+    background-color: var(--color-bg-primary);
+    color: var(--color-text-primary);
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    overflow: hidden;
+    /* App-like feel */
+    user-select: none;
+    /* Prevent text selection generally in app */
+}
+
+a {
+    text-decoration: none;
+    color: inherit;
+}
+
+button {
+    border: none;
+    background: none;
+    cursor: pointer;
+    font-family: inherit;
+    color: inherit;
+}
+
+input {
+    border: none;
+    background: none;
+    font-family: inherit;
+    color: inherit;
+    outline: none;
+}
+
+/* Custom Scrollbar for 'Exquisite' look */
+::-webkit-scrollbar {
+    width: 8px;
+    height: 8px;
+}
+
+::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+    background: var(--color-bg-tertiary);
+    border-radius: var(--radius-full);
+    -electron-corner-smoothing: 65%;
+}
+
+::-webkit-scrollbar-thumb:hover {
+    background: var(--color-text-muted);
+}

src/renderer/styles/variables.css

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+:root {
+  /* Colors - 网易云风格配色 */
+  --color-bg-primary: #121212;
+  --color-bg-secondary: #181818;
+  --color-bg-tertiary: #282828;
+  --color-bg-elevated: #2a2a2a;
+  
+  --color-text-primary: #ffffff;
+  --color-text-secondary: #b3b3b3;
+  --color-text-muted: #737373;
+  
+  --color-accent: #ec4141;
+  --color-accent-hover: #ff5555;
+  --color-accent-soft: rgba(236, 65, 65, 0.1);
+  
+  --color-border: #2a2a2a;
+  --color-border-light: #3a3a3a;
+  
+  /* Shadows - 柔和阴影效果 */
+  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.12);
+  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.16);
+  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.24);
+  --shadow-elevated: 0 12px 48px rgba(0, 0, 0, 0.32);
+  
+  /* Typography */
+  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
+  --font-size-xs: 0.75rem;
+  --font-size-sm: 0.875rem;
+  --font-size-base: 1rem;
+  --font-size-lg: 1.125rem;
+  --font-size-xl: 1.25rem;
+  --font-size-2xl: 1.5rem;
+  
+  /* Spacing & Radius - 网易云风格大圆角 */
+  --radius-sm: 8px;
+  --radius-md: 12px;
+  --radius-lg: 20px;
+  --radius-xl: 24px;
+  --radius-2xl: 32px;
+  --radius-full: 9999px;
+  
+  --sidebar-width: 240px;
+  --topbar-height: 64px;
+  
+  /* Transitions */
+  --transition-fast: 0.15s ease;
+  --transition-base: 0.25s ease;
+  --transition-slow: 0.35s ease;
+}