chore: scaffold monorepo and migrate uhd_web design system (W0-A)

- pnpm workspace: apps/{web,server}, packages/{contracts,db,domain,adapters,tasks,agent,testkit}
- server: Hono + zod-openapi, API Key auth with scopes, redacting pino logger, SSE event bus with replay, worker heartbeat
- db: Kysely + pg, file migrator, 0001_init (settings/api_key/audit_event/outbox_event)
- web: React Router 7 SPA console shell with 12 workspace placeholders, uhd_web tokens/ui/guard scripts
- docs: ADR-001 (Node over Deno), dev runbook, design system rules

Co-Authored-By: Claude Fable 5.1 <[email protected]>

apps/web/app/components/ui/slider.tsx

@@ -0,0 +1,54 @@
+import { Slider as SliderPrimitive } from "radix-ui";
+import * as React from "react";
+
+import { cn } from "~/lib/utils";
+
+function Slider({
+  className,
+  defaultValue,
+  value,
+  min = 0,
+  max = 100,
+  ...props
+}: React.ComponentProps<typeof SliderPrimitive.Root>) {
+  const _values = React.useMemo(
+    () => (Array.isArray(value) ? value : Array.isArray(defaultValue) ? defaultValue : [min, max]),
+    [value, defaultValue, min, max],
+  );
+
+  return (
+    <SliderPrimitive.Root
+      data-slot="slider"
+      defaultValue={defaultValue}
+      value={value}
+      min={min}
+      max={max}
+      className={cn(
+        "relative flex w-full touch-none items-center select-none data-[disabled]:opacity-50 data-[orientation=vertical]:h-full data-[orientation=vertical]:min-h-44 data-[orientation=vertical]:w-auto data-[orientation=vertical]:flex-col",
+        className,
+      )}
+      {...props}
+    >
+      <SliderPrimitive.Track
+        data-slot="slider-track"
+        className={cn(
+          "relative grow overflow-hidden rounded-full bg-foreground/10 data-[orientation=horizontal]:h-2 data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-2",
+        )}
+      >
+        <SliderPrimitive.Range
+          data-slot="slider-range"
+          className={cn("absolute bg-primary data-[orientation=horizontal]:h-full data-[orientation=vertical]:w-full")}
+        />
+      </SliderPrimitive.Track>
+      {Array.from({ length: _values.length }, (_, index) => (
+        <SliderPrimitive.Thumb
+          data-slot="slider-thumb"
+          key={index}
+          className="block size-5 shrink-0 cursor-grab rounded-full border-2 border-primary bg-background shadow-sm shadow-primary/25 transition-all hover:scale-110 focus-visible:outline-hidden focus-visible:ring-2 focus-visible:ring-primary active:cursor-grabbing disabled:pointer-events-none disabled:opacity-50"
+        />
+      ))}
+    </SliderPrimitive.Root>
+  );
+}
+
+export { Slider };