feat: 按功能对代码分组

docs/design-system.md

@@ -81,7 +81,7 @@ div.flex.h-dvh.flex-col                 ← (app)/layout.tsx
 
 ### 长列表（虚拟滚动）
 
-资源库使用 TanStack Virtual（`src/app/(app)/components/library-list.tsx`），同样不使用定位：
+资源库使用 TanStack Virtual（`src/app/(app)/components/library/library-list.tsx`），同样不使用定位：
 
 - 滚动容器由页面持有（上面那个唯一的 `overflow-y-auto`），虚拟器只计算该渲染哪些行。
 - 分组数据拍平成「提示 / 标题 / 一行卡片 / 空提示」四种行；可见行处于正常文档流，上下各一个占位 `div` 用 `height` 撑出未渲染部分。
@@ -185,7 +185,7 @@ div.flex.h-dvh.flex-col                 ← (app)/layout.tsx
 | 页面组件 | `library-list`、`file-card`、`login-stage` 等 | 只做接线：传选择器、参数与回调 |
 
 - 容器级交互 hook 统一签名 `useXxx(containerRef, options)`，在容器上做事件委托，彼此独立；删掉一行调用即可拆掉一个交互。
-- 目标靠 data 属性识别（`src/app/(app)/components/library-dom.ts`）：`data-file-card` 网格单元、`data-card-focus` 卡片主操作、虚拟行 `data-index`。
+- 目标靠 data 属性识别（`src/app/(app)/components/library/library-dom.ts`）：`data-file-card` 网格单元、`data-card-focus` 卡片主操作、虚拟行 `data-index`。
 - 表单等业务组件只通过回调对外通知（如 `LoginForm` 的 `onTyping / onReject / onAccept`），不知道外部如何呈现。
 
 ### 交互清单

src/app/(app)/components/file/file-card.tsx

@@ -38,7 +38,7 @@ import type { DownloadStatus } from "@/types/torbox";
 import { buildStreamUrl, toPotPlayerUrl, type MediaKind } from "@/utils/media";
 
 import { ImageCover } from "./image-cover";
-import { CARD_FOCUS_PROPS } from "./library-dom";
+import { CARD_FOCUS_PROPS } from "../library/library-dom";
 
 const ExtLabel = ({ ext }: { ext: string }) => (
   <span className="font-mono uppercase">{ext || "file"}</span>

src/app/(app)/components/header/app-header.tsx

@@ -2,7 +2,7 @@
 import { Badge } from "@/components/ui/badge";
 import { Separator } from "@/components/ui/separator";
 
-import { AddResourceButton } from "./add-resource-button";
+import { AddResourceButton } from "../add-resource/add-resource-button";
 import { HeaderBrand } from "./header-brand";
 import { LogoutButton } from "./logout-button";
 import { MobileMenu } from "./mobile-menu";

src/app/(app)/components/header/mobile-menu.tsx

@@ -23,7 +23,7 @@ import {
   useLibraryFilterStore
 } from "@/stores/library-filter-store";
 
-import { LibraryFilters } from "./library-filters";
+import { LibraryFilters } from "../library/library-filters";
 import { LogoutButton } from "./logout-button";
 
 /** 只在菜单打开时挂载，来源计数不在后台重复计算 */

src/app/(app)/components/library/library-filters.tsx

@@ -14,7 +14,7 @@ import {
 } from "@/stores/library-filter-store";
 import { formatCount } from "@/utils/format";
 
-import { SourceDot } from "./source-dot";
+import { SourceDot } from "../item/source-dot";
 
 // 数字滚动过程中的格式化：计数取整
 const formatInteger = (value: number) => formatCount(Math.round(value));

src/app/(app)/components/library/library-list.tsx

@@ -37,11 +37,11 @@ import {
 import type { SourceType } from "@/types/torbox";
 import type { MediaKind } from "@/utils/media";
 
-import { DeleteItemDialog } from "./delete-item-dialog";
-import { FileCard } from "./file-card";
-import { FileGrid, FileGridItem } from "./file-grid";
-import { ItemHeader } from "./item-header";
-import { LibraryImagePreview } from "./library-image-preview";
+import { DeleteItemDialog } from "../item/delete-item-dialog";
+import { FileCard } from "../file/file-card";
+import { FileGrid, FileGridItem } from "../file/file-grid";
+import { ItemHeader } from "../item/item-header";
+import { LibraryImagePreview } from "../preview/library-image-preview";
 import {
   CARD_FOCUS_SELECTOR,
   CARD_PROPS,
@@ -59,7 +59,7 @@ import {
   type LibraryRow,
   type RowPiece
 } from "./library-rows";
-import { LibraryVideoDialog } from "./library-video-dialog";
+import { LibraryVideoDialog } from "../preview/library-video-dialog";
 import { SourceNotice } from "./source-notice";
 
 /** 列表顶部留白；首个分组标题自带 8px 上留白，合计 20px */

src/app/(app)/components/library/library-skeleton.tsx

@@ -1,7 +1,7 @@
 // 资源列表加载骨架屏
 import { Skeleton } from "@/components/ui/skeleton";
 
-import { FileGrid } from "./file-grid";
+import { FileGrid } from "../file/file-grid";
 
 export const LibrarySkeleton = () => (
   <div

src/app/(app)/components/preview/library-image-preview.tsx

@@ -10,7 +10,10 @@ import type { LibraryItemView } from "@/hooks/use-library";
 import { useOrigin } from "@/hooks/use-origin";
 import { buildStreamUrl } from "@/utils/media";
 
-import { findLibraryItem, type LibraryFileTarget } from "./library-rows";
+import {
+  findLibraryItem,
+  type LibraryFileTarget
+} from "../library/library-rows";
 
 /** 灯箱连同样式较大，第一次预览图片时才加载 */
 const ImageLightbox = dynamic(

src/app/(app)/components/preview/library-video-dialog.tsx

@@ -32,7 +32,10 @@ import { useVideoDialogStore } from "@/stores/video-dialog-store";
 import { formatBytes } from "@/utils/format";
 import { buildHlsUrl, buildStreamUrl, toPotPlayerUrl } from "@/utils/media";
 
-import { findLibraryItem, type LibraryFileTarget } from "./library-rows";
+import {
+  findLibraryItem,
+  type LibraryFileTarget
+} from "../library/library-rows";
 import { VideoPlaylist } from "./video-playlist";
 
 /** 16:9 铺满主列，尺寸由主列宽度决定。手机宽度下贴边、去掉圆角 */

src/app/(app)/layout.tsx

@@ -3,7 +3,7 @@ import { isMockMode } from "@/server/env";
 import { isSearchAvailable } from "@/server/search";
 import { requireSessionToken } from "@/server/session";
 
-import { AppHeader } from "./components/app-header";
+import { AppHeader } from "./components/header/app-header";
 
 /** 登录后页面骨架：纵向 flex，header 不参与滚动，滚动发生在各页面内部的内容区 */
 const AppLayout = async ({ children }: { children: React.ReactNode }) => {

src/app/(app)/page.tsx

@@ -3,7 +3,7 @@ import type { Metadata } from "next";
 
 import { requireSessionToken } from "@/server/session";
 
-import { LibraryView } from "./components/library-view";
+import { LibraryView } from "./components/library/library-view";
 
 export const metadata: Metadata = {
   title: "资源库"