feat: add http, snmp, docker plugins; new widgets and routes for traefik/unifi/ups

- Add HTTP monitor plugin: endpoint checking with status history, latency tracking, time-range views
- Add SNMP plugin: OID polling, device management, metric recording
- Add Docker plugin: container status, resource usage, widget
- Traefik: access log widget, request chart widget, expanded routes
- UniFi: clients widget, devices widget, expanded poll routes
- UPS: history widget, additional routes
- Update plugin index with new entries

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

docker/migrations/env.py

@@ -0,0 +1,70 @@
+# plugins/docker/migrations/env.py
+"""Alembic env.py for the Docker plugin."""
+import asyncio
+import os
+import sys
+from pathlib import Path
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+from alembic import context
+
+sys.path.insert(0, str(Path(__file__).parent.parent.parent.parent))
+
+from fabledscryer.models.base import Base
+import fabledscryer.models  # noqa: F401
+from plugins.docker.models import DockerContainer, DockerMetric  # noqa: F401
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def _get_url() -> str:
+    import yaml
+    cfg_path = os.environ.get("FABLEDSCRYER_CONFIG", "config.yaml")
+    try:
+        with open(cfg_path) as f:
+            cfg = yaml.safe_load(f) or {}
+        url = cfg.get("database", {}).get("url", "")
+    except FileNotFoundError:
+        url = ""
+    return os.environ.get("FABLEDSCRYER_DATABASE__URL", url)
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=_get_url(), target_metadata=target_metadata,
+        literal_binds=True, dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    cfg = config.get_section(config.config_ini_section, {})
+    cfg["sqlalchemy.url"] = _get_url()
+    connectable = async_engine_from_config(cfg, prefix="sqlalchemy.", poolclass=pool.NullPool)
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()