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/feed_entry.html

@@ -0,0 +1 @@
+{% for section in issue.sections %}<h2>{{ section.name }}</h2><ul>{% for entry in section.entries %}<li><a href="{{ entry.url }}">{{ entry.title }}</a> — {{ entry.source }} ({{ entry.domain }}){% if !entry.comment_links.is_empty() %} · {% for link in entry.comment_links %}<a href="{{ link.url }}">{{ link.label }}</a>{% endfor %}{% endif %}</li>{% endfor %}</ul>{% endfor %}