step 2 with basic crud implemented

app/templates/boxes/form.html

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+{% extends "base.html" %}
+
+{% block content %}
+<div class="page-header">
+    <h1>{{ page_title }}</h1>
+    <a href="/boxes">返回箱子列表</a>
+</div>
+
+<form method="post" action="{{ form_action }}" class="stack">
+    <label>
+        名称
+        <input type="text" name="name" value="{{ box.name if box else '' }}" required>
+    </label>
+    <label>
+        房间
+        <input type="text" name="room" value="{{ box.room if box and box.room else '' }}">
+    </label>
+    <label>
+        状态
+        <input type="text" name="status" value="{{ box.status if box and box.status else '' }}">
+    </label>
+    <label>
+        备注
+        <textarea name="note" rows="4">{{ box.note if box and box.note else '' }}</textarea>
+    </label>
+    <button type="submit">{{ submit_label }}</button>
+</form>
+{% endblock %}

app/templates/boxes/index.html

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+{% extends "base.html" %}
+
+{% block content %}
+<div class="page-header">
+    <div>
+        <h1>箱子</h1>
+        <p class="muted">这里管理顶层搬家容器，例如纸箱、行李箱或大收纳箱。</p>
+    </div>
+    <a class="button" href="/boxes/new">新建箱子</a>
+</div>
+
+{% if boxes %}
+<div class="stack">
+    {% for box in boxes %}
+    <section class="card">
+        <h2><a href="/boxes/{{ box.id }}">{{ box.name }}</a></h2>
+        <p class="meta">物品数：{{ box.items|length }}</p>
+        {% if box.room %}<p>房间：{{ box.room }}</p>{% endif %}
+        {% if box.status %}<p>状态：{{ box.status }}</p>{% endif %}
+        {% if box.note %}<p>{{ box.note }}</p>{% endif %}
+        <div class="actions">
+            <a href="/boxes/{{ box.id }}">查看详情</a>
+            <a href="/boxes/{{ box.id }}/edit">编辑</a>
+        </div>
+    </section>
+    {% endfor %}
+</div>
+{% else %}
+<section class="card">
+    <p>还没有箱子。</p>
+    <a href="/boxes/new">创建第一个箱子</a>
+</section>
+{% endif %}
+{% endblock %}

app/templates/boxes/show.html

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+{% extends "base.html" %}
+
+{% block content %}
+<div class="page-header">
+    <div>
+        <h1>{{ box.name }}</h1>
+        <p class="muted">查看这个箱子的基本信息，以及它下面的直接物品。</p>
+    </div>
+    <div class="actions">
+        <a href="/boxes">返回箱子列表</a>
+        <a class="button" href="/boxes/{{ box.id }}/items/new">添加物品</a>
+    </div>
+</div>
+
+<section class="card">
+    <p><strong>房间：</strong> {{ box.room or '-' }}</p>
+    <p><strong>状态：</strong> {{ box.status or '-' }}</p>
+    <p><strong>备注：</strong> {{ box.note or '-' }}</p>
+    <div class="actions">
+        <a href="/boxes/{{ box.id }}/edit">编辑箱子</a>
+        <form method="post" action="/boxes/{{ box.id }}/delete">
+            <button type="submit" class="link-button">删除箱子</button>
+        </form>
+    </div>
+</section>
+
+<section class="stack">
+    <h2>物品</h2>
+    {% if box.items %}
+        {% for item in box.items %}
+        <article class="card">
+            <h3><a href="/items/{{ item.id }}">{{ item.name }}</a></h3>
+            <p><strong>是否容器：</strong> {{ "是" if item.is_container else "否" }}</p>
+            {% if item.quantity is not none %}<p><strong>数量：</strong> {{ item.quantity }}</p>{% endif %}
+            {% if item.note %}<p><strong>备注：</strong> {{ item.note }}</p>{% endif %}
+            <div class="actions">
+                <a href="/items/{{ item.id }}">查看详情</a>
+                <a href="/items/{{ item.id }}/edit">编辑</a>
+                {% if item.is_container %}
+                <a href="/items/{{ item.id }}">查看内部内容</a>
+                {% endif %}
+                <form method="post" action="/items/{{ item.id }}/delete">
+                    <button type="submit" class="link-button">删除</button>
+                </form>
+            </div>
+        </article>
+        {% endfor %}
+    {% else %}
+    <section class="card">
+        <p>这个箱子里还没有物品。</p>
+    </section>
+    {% endif %}
+</section>
+{% endblock %}