feat(auth): 重构登录页面并添加忘记密码路由

- 重构登录表单 UI，使用 DaisyUI 组件美化界面
- 添加记住我功能和加载状态提示
- 集成 Toast 提示组件用于显示登录结果
- 新增忘记密码页面路由
- 实现全局 Toast 消息提醒功能
- 在根布局中引入 ToastContainer 组件

src/lib/components/ToastContainer.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+	import { toast } from '$lib/stores/toastStore';
+	import { fly } from 'svelte/transition';
+	import { flip } from 'svelte/animate';
+
+	// 映射 Toast 类型到 daisyUI 的 alert 样式类
+	const alertStyles = {
+		info: 'alert-info',
+		success: 'alert-success',
+		warning: 'alert-warning',
+		error: 'alert-error'
+	};
+
+	// 映射 Toast 类型到图标 (可选，为了更像 AntD)
+	const icons = {
+		info: 'ℹ️',
+		success: '✅',
+		warning: '⚠️',
+		error: '❌'
+	};
+</script>
+
+<div class="toast  toast-top toast-center z-50">
+	{#each $toast as t (t.id)}
+		<div
+			animate:flip={{ duration: 300 }}
+			transition:fly={{ x: 100, duration: 300 }}
+			class="alert {alertStyles[t.type]} shadow-lg min-w-[200px] flex justify-start"
+		>
+			<span>{icons[t.type]}</span>
+			<span>{t.message}</span>
+		</div>
+	{/each}
+</div>

src/lib/stores/toastStore.ts

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+import { writable } from 'svelte/store';
+
+export type ToastType = 'success' | 'error' | 'warning' | 'info';
+
+export interface ToastMessage {
+	id: string;
+	type: ToastType;
+	message: string;
+	duration?: number;
+}
+
+const createToastStore = () => {
+
+	const {subscribe, update} = writable<ToastMessage[]>([]);
+	const send  = (message:string, type:ToastType = 'info',duration = 3000)=> {
+		const id = crypto.randomUUID();
+		update((toasts) => [...toasts,{id,type,message,duration}])
+		if (duration > 0){
+			setTimeout(()=>{
+				remove(id);
+			},duration)
+		}
+	}
+	const remove = (id:string) => {
+		update((toasts) => toasts.filter(toast => toast.id !== id))
+	}
+
+	return {
+		subscribe,
+		success: (msg: string, duration = 3000) => send(msg, 'success', duration),
+		error: (msg: string, duration = 3000) => send(msg, 'error', duration),
+		warning: (msg: string, duration = 3000) => send(msg, 'warning', duration),
+		info: (msg: string, duration = 3000) => send(msg, 'info', duration),
+		remove
+	};
+};
+
+
+export const toast = createToastStore();