Web dashboard step 1: migration, sessions, users CLI, public site

Migration 0004 (users, sessions, config_changes, profile_versions, jobs,
rating_events.user_id, runs.report_json, issues.issue_json), the issue
snapshot writer and loader, the web module skeleton with layout and static
assets, axum-login/tower-sessions over a sqlx session store, password-auth
users with a CLI, the login throttle, the origin check, security headers,
and the public issue pages, archive, Atom feed and robots.txt.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NHyYupFdBiR4VfoUM7NjSM

src/web/templates/issue_list.html

@@ -0,0 +1 @@
+{% extends "layout.html" %}{% block content %}<section class="reading"><h1>Issue archive</h1>{% for month in months %}<h2>{{ month.label }}</h2><ul>{% for issue in month.issues %}<li><a href="/issues/{{ issue.date }}">{{ issue.display_date }}</a> · No. {{ issue.issue_number }} · {{ issue.article_count }} articles</li>{% endfor %}</ul>{% endfor %}</section>{% endblock %}