feat: 完善项目架构并增强分析页面功能

- 新增项目文档和 Docker 配置
  - 添加 README.md 和 TODO.md 项目文档
  - 为各服务添加 Dockerfile 和 docker-compose 配置

- 重构后端架构
  - 新增 adapter 层（HTTP/Python 适配器）
  - 新增 repository 层（数据访问抽象）
  - 新增 router 模块统一管理路由
  - 新增账单处理 handler

- 扩展前端 UI 组件库
  - 新增 Calendar、DateRangePicker、Drawer、Popover 等组件
  - 集成 shadcn-svelte 组件库

- 增强分析页面功能
  - 添加时间范围筛选器（支持本月默认值）
  - 修复 DateRangePicker 默认值显示问题
  - 优化数据获取和展示逻辑

- 完善分析器服务
  - 新增 FastAPI 服务接口
  - 改进账单清理器实现

web/src/lib/components/ui/popover/index.ts

@@ -0,0 +1,19 @@
+import Root from "./popover.svelte";
+import Close from "./popover-close.svelte";
+import Content from "./popover-content.svelte";
+import Trigger from "./popover-trigger.svelte";
+import Portal from "./popover-portal.svelte";
+
+export {
+	Root,
+	Content,
+	Trigger,
+	Close,
+	Portal,
+	//
+	Root as Popover,
+	Content as PopoverContent,
+	Trigger as PopoverTrigger,
+	Close as PopoverClose,
+	Portal as PopoverPortal,
+};

web/src/lib/components/ui/popover/popover-close.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { Popover as PopoverPrimitive } from "bits-ui";
+
+	let { ref = $bindable(null), ...restProps }: PopoverPrimitive.CloseProps = $props();
+</script>
+
+<PopoverPrimitive.Close bind:ref data-slot="popover-close" {...restProps} />

web/src/lib/components/ui/popover/popover-content.svelte

@@ -0,0 +1,31 @@
+<script lang="ts">
+	import { Popover as PopoverPrimitive } from "bits-ui";
+	import PopoverPortal from "./popover-portal.svelte";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+	import type { ComponentProps } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		sideOffset = 4,
+		align = "center",
+		portalProps,
+		...restProps
+	}: PopoverPrimitive.ContentProps & {
+		portalProps?: WithoutChildrenOrChild<ComponentProps<typeof PopoverPortal>>;
+	} = $props();
+</script>
+
+<PopoverPortal {...portalProps}>
+	<PopoverPrimitive.Content
+		bind:ref
+		data-slot="popover-content"
+		{sideOffset}
+		{align}
+		class={cn(
+			"bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-end-2 data-[side=right]:slide-in-from-start-2 data-[side=top]:slide-in-from-bottom-2 z-50 w-72 origin-(--bits-popover-content-transform-origin) rounded-md border p-4 shadow-md outline-hidden",
+			className
+		)}
+		{...restProps}
+	/>
+</PopoverPortal>

web/src/lib/components/ui/popover/popover-portal.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { Popover as PopoverPrimitive } from "bits-ui";
+
+	let { ...restProps }: PopoverPrimitive.PortalProps = $props();
+</script>
+
+<PopoverPrimitive.Portal {...restProps} />

web/src/lib/components/ui/popover/popover-trigger.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+	import { cn } from "$lib/utils.js";
+	import { Popover as PopoverPrimitive } from "bits-ui";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: PopoverPrimitive.TriggerProps = $props();
+</script>
+
+<PopoverPrimitive.Trigger
+	bind:ref
+	data-slot="popover-trigger"
+	class={cn("", className)}
+	{...restProps}
+/>

web/src/lib/components/ui/popover/popover.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { Popover as PopoverPrimitive } from "bits-ui";
+
+	let { open = $bindable(false), ...restProps }: PopoverPrimitive.RootProps = $props();
+</script>
+
+<PopoverPrimitive.Root bind:open {...restProps} />