Initial scaffold: Flask webui + APScheduler + Playwright automation for MassPrice rule scheduling

Drives massprice.tcgplayer.com's Run Rule action per-rule on a
user-configured schedule (multiple times/day, day-of-week toggles),
replacing MassPrice's native scheduler (capped at 15 schedules
account-wide, one run/day, with observed clock drift). Deployed via
Forgejo push-to-deploy on Unraid, matching arr-summary/card-grader.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6TgffxTvYhqxykAbVQg2v

templates/activity.html

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+{% extends "_shell.html" %}
+{% block title %}Activity · MassPrice Scheduler{% endblock %}
+{% block content %}
+<h1>Activity</h1>
+{% if not history %}
+<p class="empty-state">No runs recorded yet.</p>
+{% else %}
+<table class="activity-table">
+  <thead>
+    <tr><th>Time</th><th>Rule</th><th>Status</th><th>Message</th></tr>
+  </thead>
+  <tbody>
+    {% for entry in history %}
+    <tr class="status-row-{{ entry.status }}">
+      <td>{{ entry.timestamp }}</td>
+      <td>{{ entry.rule_name or entry.rule_id }}</td>
+      <td><span class="status-dot status-{{ entry.status }}"></span>{{ entry.status }}</td>
+      <td class="muted">{{ entry.message }}</td>
+    </tr>
+    {% endfor %}
+  </tbody>
+</table>
+{% endif %}
+{% endblock %}