26.9(安全审计修复版)

Go 1.27.1 (Gin+GORM) + Vue 3 文件快传服务:

- 安全审计全部修复(docs/security-audit-2026-09-05.md):
  bcrypt 密码哈希与自动升级、presign 直传服务端大小/内容校验、
  全局请求体上限、依赖升级(govulncheck 0 命中)、janitor 后台清理、
  管理端审计动作落库、/admin CORS 收紧、通知内容白名单净化、
  会话默认 7 天、限流缓存故障降级、robots.txt 端点等
- 前端:取件链接复制修复(不再重复拼接提取码)、markdown 净化器加固
- Redis 支持库号(FCB_REDIS_DB / redis://…/db URL)
- 文档:docs/api/* 与 openapi.yaml 同步最新行为(robots.txt、
  提码 5 位起、chunk 32MiB 上限、admin 审计动作等)

验证:gofmt/go vet/go test 全绿;二进制端到端冒烟通过
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/**
* 主题系统(需求②):
* - 三态:light / dark / system(跟随 prefers-color-scheme
* - 默认跟随系统;localStorage 记忆(键 fcb_theme_mode
* - 实际生效主题写入 <html data-theme="light|dark">CSS 变量按此切换
* - Naive UI darkTheme 由 App.vue 读取 useTheme().resolved 响应式传递
*/
import { ref, watch } from 'vue'
export type ThemeMode = 'light' | 'dark' | 'system'
export type ResolvedTheme = 'light' | 'dark'
export const THEME_MODES: ThemeMode[] = ['light', 'dark', 'system']
const STORAGE_KEY = 'fcb_theme_mode'
function readStoredMode(): ThemeMode | null {
try {
const v = localStorage.getItem(STORAGE_KEY)
return v === 'light' || v === 'dark' || v === 'system' ? v : null
} catch {
return null
}
}
function persist(mode: ThemeMode): void {
try {
localStorage.setItem(STORAGE_KEY, mode)
} catch {
/* ignore */
}
}
function systemPrefersDark(): boolean {
return typeof matchMedia === 'function' && matchMedia('(prefers-color-scheme: dark)').matches
}
/** 当前模式(未初始化时按 localStorage → 默认 system */
const mode = ref<ThemeMode>(readStoredMode() ?? 'system')
/** 实际生效主题(响应式,供 Naive UI 与 <html data-theme> 使用) */
const resolved = ref<ResolvedTheme>(mode.value === 'system' ? (systemPrefersDark() ? 'dark' : 'light') : mode.value)
let started = false
/** 初始化系统主题监听(App.vue 挂载时调用一次) */
function start(): void {
if (started || typeof matchMedia !== 'function') return
started = true
const mq = matchMedia('(prefers-color-scheme: dark)')
mq.addEventListener?.('change', () => {
if (mode.value === 'system') resolved.value = mq.matches ? 'dark' : 'light'
})
}
function apply(): void {
start()
resolved.value = mode.value === 'system' ? (systemPrefersDark() ? 'dark' : 'light') : mode.value
document.documentElement.dataset.theme = resolved.value
}
watch(mode, apply, { immediate: true })
/** 切换模式并记忆(需求②:导航栏三态切换 + localStorage */
export function setThemeMode(next: ThemeMode): void {
mode.value = next
persist(next)
}
export function useTheme() {
return {
mode,
resolved,
setMode: setThemeMode,
}
}