feat: add portal allauth account flow

apps/portal/templates/account/email/email_confirmation_message.txt

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+你好，
+
+请打开下面的链接完成 cmhub 邮箱验证：
+
+{{ activate_url }}
+
+如果这不是你的操作，可以忽略本邮件。

apps/portal/templates/account/email/email_confirmation_subject.txt

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+[cmhub] 验证你的邮箱

apps/portal/templates/account/login.html

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+{% extends "portal/base.html" %}
+
+{% block title %}登录 - cmhub{% endblock %}
+
+{% block content %}
+<section class="cmhub-panel">
+  <h1 class="h4 mb-3">登录</h1>
+  <form method="post" action="{% url 'portal-login' %}">
+    {% csrf_token %}
+    {{ form.non_field_errors }}
+    {{ form.as_p }}
+    {% if redirect_field_value %}
+      <input type="hidden" name="{{ redirect_field_name }}" value="{{ redirect_field_value }}">
+    {% endif %}
+    <button class="btn btn-primary w-100" type="submit">登录</button>
+  </form>
+  <div class="mt-3 text-secondary">
+    没有账号？<a href="{% url 'portal-signup' %}">注册</a>
+  </div>
+</section>
+{% endblock %}

apps/portal/templates/account/logout.html

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+{% extends "portal/base.html" %}
+
+{% block title %}退出 - cmhub{% endblock %}
+
+{% block content %}
+<section class="cmhub-panel">
+  <h1 class="h4 mb-3">退出登录</h1>
+  <form method="post" action="{% url 'portal-logout' %}">
+    {% csrf_token %}
+    <button class="btn btn-primary w-100" type="submit">退出</button>
+  </form>
+</section>
+{% endblock %}

apps/portal/templates/account/signup.html

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+{% extends "portal/base.html" %}
+
+{% block title %}注册 - cmhub{% endblock %}
+
+{% block content %}
+<section class="cmhub-panel">
+  <h1 class="h4 mb-3">注册</h1>
+  <form method="post" action="{% url 'portal-signup' %}">
+    {% csrf_token %}
+    {{ form.non_field_errors }}
+    {{ form.as_p }}
+    {% if redirect_field_value %}
+      <input type="hidden" name="{{ redirect_field_name }}" value="{{ redirect_field_value }}">
+    {% endif %}
+    <button class="btn btn-primary w-100" type="submit">注册</button>
+  </form>
+  <div class="mt-3 text-secondary">
+    已有账号？<a href="{% url 'portal-login' %}">登录</a>
+  </div>
+</section>
+{% endblock %}

apps/portal/templates/account/verification_sent.html

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+{% extends "portal/base.html" %}
+
+{% block title %}验证邮箱 - cmhub{% endblock %}
+
+{% block content %}
+<section class="cmhub-panel">
+  <h1 class="h4 mb-3">验证邮箱</h1>
+  <p class="mb-0 text-secondary">验证邮件已发送，请先完成邮箱验证再登录。</p>
+</section>
+{% endblock %}