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/auth/login.html

@@ -0,0 +1,20 @@
+{% extends "base.html" %}
+{% block title %}Login — Fabled Scryer{% endblock %}
+{% block content %}
+<div style="max-width:400px;margin:4rem auto;">
+    <div class="card">
+        <h2 class="page-title">Sign In</h2>
+        <form method="post" action="/login">
+            <div class="form-group">
+                <label>Username</label>
+                <input type="text" name="username" autofocus required>
+            </div>
+            <div class="form-group">
+                <label>Password</label>
+                <input type="password" name="password" required>
+            </div>
+            <button type="submit" class="btn">Sign In</button>
+        </form>
+    </div>
+</div>
+{% endblock %}

fabledscryer/templates/auth/setup.html

@@ -0,0 +1,25 @@
+{% extends "base.html" %}
+{% block title %}First-Run Setup — Fabled Scryer{% endblock %}
+{% block content %}
+<div style="max-width:400px;margin:4rem auto;">
+    <div class="card">
+        <h2 class="page-title" style="margin-bottom:0.5rem;">First-Run Setup</h2>
+        <p style="margin-bottom:1.5rem;color:var(--text-muted);font-size:0.9rem;">Create the initial admin account.</p>
+        <form method="post" action="/setup">
+            <div class="form-group">
+                <label>Username</label>
+                <input type="text" name="username" autofocus required>
+            </div>
+            <div class="form-group">
+                <label>Email</label>
+                <input type="email" name="email" required>
+            </div>
+            <div class="form-group">
+                <label>Password</label>
+                <input type="password" name="password" required>
+            </div>
+            <button type="submit" class="btn">Create Admin Account</button>
+        </form>
+    </div>
+</div>
+{% endblock %}