feat: rename to FabledScryer, multi-dashboard system, plugin management, branding

- Rename package fablednetmon → fabledscryer throughout
- Multi-dashboard: ownership, per-user defaults, HTMX edit (add/remove/reorder)
- Read-only share tokens scoped to individual dashboards
- Dashboard edit is HTMX-driven (no page reloads)
- Plugin management system: remote catalog, download/install, hot-reload, in-app restart
- plugin_index.py: fetch/cache remote index.yaml; default URL → bvandeusen/fabledscryer-plugins
- plugin_manager.py: download_and_install_plugin, hot_reload_plugin, restart_app
  - ZIP extraction handles GitHub archive formats (name-v1.0.0/, name-main/)
- Settings split into tabbed sections: General, Notifications, Ansible, Plugins
- Plugins tab: catalog browser (HTMX), install/activate/update/restart actions
- UI/branding: dark palette (#07071a), crystal ball SVG logo, animated star field,
  Libertinus Serif applied to headings, nav, labels, and section titles
- Widget registry (core/widgets.py) for dashboard plugin integration
- UPS widget.html (dashboard card) and settings/_tabs.html include
- Migrations 0005–0008: dashboards, is_default, ownership, share tokens
- docs/plugins/: writing-a-plugin.md updated with publishing guide,
  index.yaml.example template for fabledscryer-plugins repo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fabledscryer/templates/settings/ansible.html

@@ -0,0 +1,22 @@
+{# fabledscryer/templates/settings/ansible.html #}
+{% extends "base.html" %}
+{% block title %}Settings — Ansible — Fabled Scryer{% endblock %}
+{% block content %}
+{% set active_tab = "ansible" %}
+{% include "settings/_tabs.html" %}
+
+<form method="post" action="/settings/ansible/">
+<div class="card" style="max-width:720px;">
+  <h2 class="section-title" style="margin-bottom:0.5rem;">Ansible Sources</h2>
+  <p style="color:var(--text-muted);font-size:0.85rem;margin-bottom:1rem;">
+    JSON array of source objects. Each requires <code>name</code>, <code>type</code>
+    (<code>git</code> or <code>local</code>), and either <code>url</code> or <code>path</code>.
+  </p>
+  <textarea name="ansible.sources" rows="12"
+            style="font-family:ui-monospace,monospace;font-size:0.85rem;width:100%;">{{ settings['ansible.sources'] | tojson(indent=2) }}</textarea>
+</div>
+<div style="margin-top:1rem;">
+  <button type="submit" class="btn">Save</button>
+</div>
+</form>
+{% endblock %}