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/account.html

@@ -0,0 +1 @@
+{% extends "layout.html" %}{% block content %}<section class="reading narrow"><h1>Account</h1>{% if !error.is_empty() %}<p class="error">{{ error }}</p>{% endif %}<form method="post" action="/account/password"><label>Current password <input type="password" name="current_password" required></label><label>New password <input type="password" name="new_password" minlength="12" required></label><label>Confirm password <input type="password" name="confirm_password" minlength="12" required></label><button>Change password</button></form><form method="post" action="/account/logout-all" data-confirm="Sign out everywhere?"><button>Sign out everywhere</button></form><form method="post" action="/logout"><button>Sign out</button></form></section>{% endblock %}