style(ui): 全站清除紫色系，统一 Memphis 蜡笔配色

- Logo 渐变从粉紫改为橙/粉/蓝蜡笔色，快门圆点改橙色
- 批量替换 accent：violet→orange、fuchsia→rose、indigo→sky、purple→orange，
  十六进制与 rgb 字面量同步换算为 Tailwind 对应色
- 修复类名合并冲突：管理员筛选 pill 改 fp-orange、会员号改 fp-pink（新增），
  style.css 中去重 fp-rose/fp-orange 并补 fp-pink 的浅色模式变体
- 选区色、标签输入框、筛选 pill、图表、滑块等所有紫色残留全部归位

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

frontend/src/components/UpstreamModal.vue

@@ -98,8 +98,8 @@ async function submit() {
           <div v-else class="flex flex-wrap gap-1.5 max-h-44 overflow-y-auto rounded-lg ring-1 ring-slate-200 bg-slate-50/60 p-2">
             <button v-for="m in allModels" :key="m.id" type="button" @click="toggle(m.id)"
                     class="inline-flex items-center gap-1.5 px-2.5 py-1 rounded-md text-xs ring-1 transition-colors"
-                    :class="selected.includes(m.id) ? 'bg-indigo-500/15 text-indigo-700 ring-indigo-300 font-medium' : 'bg-white text-slate-600 ring-slate-200 hover:ring-slate-300'">
-              <span class="w-1.5 h-1.5 rounded-full" :class="m.type === 'video' ? 'bg-violet-400' : 'bg-emerald-400'"></span>{{ m.alias || m.id }}
+                    :class="selected.includes(m.id) ? 'bg-sky-500/15 text-sky-700 ring-sky-300 font-medium' : 'bg-white text-slate-600 ring-slate-200 hover:ring-slate-300'">
+              <span class="w-1.5 h-1.5 rounded-full" :class="m.type === 'video' ? 'bg-orange-400' : 'bg-emerald-400'"></span>{{ m.alias || m.id }}
             </button>
           </div>
         </div>