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/models/hosts.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+import enum
+import uuid
+from datetime import datetime, timezone
+from sqlalchemy import Boolean, DateTime, Enum, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column
+from .base import Base
+
+
+class ProbeType(str, enum.Enum):
+    tcp = "tcp"
+    icmp = "icmp"
+
+
+class Host(Base):
+    __tablename__ = "hosts"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    name: Mapped[str] = mapped_column(String(128), nullable=False)
+    address: Mapped[str] = mapped_column(String(255), nullable=False)
+    probe_type: Mapped[ProbeType] = mapped_column(Enum(ProbeType), nullable=False, default=ProbeType.tcp)
+    probe_port: Mapped[int] = mapped_column(Integer, nullable=False, default=80)
+    ping_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    dns_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    dns_expected_ip: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    poll_interval_seconds: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, default=lambda: datetime.now(timezone.utc)
+    )