refactor: 重组 components/ 和 pages/ 文件结构，按职责分层

components/ 拆为三层：
  - providers/   — 状态管理（App/Theme/SettingsProvider）
  - shell/       — 应用外壳（Layout/NavBar/PageDispatcher）
  - ui/          — 通用 UI 原子（FloatingPanel/LegalTextModal）

pages/ 重命名 + 重组：
  - headers/ → panels/        NavBar 触发的面板页
  - login/   → auth/          认证模块（含注册/忘记密码）
  - settings/blocks/ → sections/
  - home/components/ → panels/ features/ controls/ hooks/
    按职责分：panels(布局壳) + features(功能面板) + controls(表单控件) + hooks

其他清理：
  - 删除空占位 Test3.tsx
  - HomeContext 从 HomeContent 拆出独立文件
  - uploadValidation 内联到 ImageInput
  - 修复过时注释（useUI → controls）

src/components/providers/SettingsProvider.tsx

@@ -0,0 +1,140 @@
+// ============================================================
+// SettingsProvider — 设置项集中状态管理 Context + Provider + Hook
+//
+// 职责：
+//   - 存储路径的集中管理（read/write/clear）
+//   - 持久化到 localStorage，遵循 ele-heixiu-* 键名规范
+//   - 全局组件通过 useSettings() 消费
+// ============================================================
+
+import { createContext, useContext, useState, useCallback, type ReactNode } from 'react';
+
+// ---------- localStorage 键 ----------
+
+const OUTPUT_PATH_KEY = 'ele-heixiu-output-path';
+const TEAM_REPO_PATH_KEY = 'ele-heixiu-team-repo-path';
+
+// ---------- Context 类型 ----------
+
+export interface SettingsContextValue {
+   /** 大模型产物存储仓库路径 */
+   outputPath: string;
+   /** 团队创作存储仓库路径（企业版） */
+   teamRepoPath: string;
+   /** 设置产物输出路径 */
+   setOutputPath: (path: string) => void;
+   /** 设置团队创作仓库路径 */
+   setTeamRepoPath: (path: string) => void;
+   /** 清除产物输出路径 */
+   clearOutputPath: () => void;
+   /** 清除团队创作仓库路径 */
+   clearTeamRepoPath: () => void;
+}
+
+export const SettingsContext = createContext<SettingsContextValue | null>(null);
+
+// ---------- 工具函数（localStorage 读写）----------
+
+export function readStoredOutputPath(): string {
+   try {
+      return localStorage.getItem(OUTPUT_PATH_KEY) || '';
+   } catch {
+      return '';
+   }
+}
+
+export function writeStoredOutputPath(path: string): void {
+   try {
+      localStorage.setItem(OUTPUT_PATH_KEY, path);
+   } catch {
+      /* 静默忽略 */
+   }
+}
+
+export function clearStoredOutputPath(): void {
+   try {
+      localStorage.removeItem(OUTPUT_PATH_KEY);
+   } catch {
+      /* 静默忽略 */
+   }
+}
+
+export function readStoredTeamRepoPath(): string {
+   try {
+      return localStorage.getItem(TEAM_REPO_PATH_KEY) || '';
+   } catch {
+      return '';
+   }
+}
+
+export function writeStoredTeamRepoPath(path: string): void {
+   try {
+      localStorage.setItem(TEAM_REPO_PATH_KEY, path);
+   } catch {
+      /* 静默忽略 */
+   }
+}
+
+export function clearStoredTeamRepoPath(): void {
+   try {
+      localStorage.removeItem(TEAM_REPO_PATH_KEY);
+   } catch {
+      /* 静默忽略 */
+   }
+}
+
+// ---------- Consumer Hook ----------
+
+export function useSettings(): SettingsContextValue {
+   const ctx = useContext(SettingsContext);
+   if (!ctx) {
+      throw new Error('useSettings() 必须在 <SettingsProvider> 内部调用');
+   }
+   return ctx;
+}
+
+// ---------- Provider 组件 ----------
+
+interface SettingsProviderProps {
+   children: ReactNode;
+}
+
+export function SettingsProvider({ children }: SettingsProviderProps) {
+   const [outputPath, setOutputPathState] = useState<string>(readStoredOutputPath);
+   const [teamRepoPath, setTeamRepoPathState] = useState<string>(readStoredTeamRepoPath);
+
+   // ---------- outputPath ----------
+
+   const setOutputPath = useCallback((path: string) => {
+      setOutputPathState(path);
+      writeStoredOutputPath(path);
+   }, []);
+
+   const clearOutputPath = useCallback(() => {
+      setOutputPathState('');
+      clearStoredOutputPath();
+   }, []);
+
+   // ---------- teamRepoPath ----------
+
+   const setTeamRepoPath = useCallback((path: string) => {
+      setTeamRepoPathState(path);
+      writeStoredTeamRepoPath(path);
+   }, []);
+
+   const clearTeamRepoPath = useCallback(() => {
+      setTeamRepoPathState('');
+      clearStoredTeamRepoPath();
+   }, []);
+
+   const value: SettingsContextValue = {
+      outputPath,
+      teamRepoPath,
+      setOutputPath,
+      setTeamRepoPath,
+      clearOutputPath,
+      clearTeamRepoPath,
+   };
+
+   return <SettingsContext.Provider value={value}>{children}</SettingsContext.Provider>;
+}