T1/Phase 1: scaffold Vite SPA + Hono API + Bun worker

- apps/web: Vite + React 19 + TanStack Router/Query + shadcn/ui
   - apps/api: Hono + Bun on :3001 with /api/health, /api/auth/*, /mcp stubs
   - apps/worker: Bun worker stub, DB connection, graceful SIGTERM
   - apps/web-legacy/: old Next.js code moved aside (preserved for T2-T8 reference)
   - Dockerfiles: api (Bun), worker (Bun), spa (multi-stage Caddy)
   - Caddyfile: serves dist + reverse-proxies /api/* + /mcp to api
   - docker-compose.yml: 4-service target (api, spa, db, worker)
   - packages/db/src/client.ts: shared Drizzle client for api + worker
   - db/client.ts: root-level alias for convenience

   Parent: t_e1cbd87d -> t_24c9c3fd (T0)

apps/web-legacy/components/ui/toggle.tsx

@@ -0,0 +1,44 @@
+'use client';
+
+import * as React from 'react';
+import * as TogglePrimitive from '@radix-ui/react-toggle';
+import { cva, type VariantProps } from 'class-variance-authority';
+
+import { cn } from '@/lib/utils';
+
+const toggleVariants = cva(
+  'inline-flex items-center justify-center rounded-md text-sm font-medium ring-offset-background transition-colors hover:bg-muted hover:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 data-[state=on]:bg-accent data-[state=on]:text-accent-foreground',
+  {
+    variants: {
+      variant: {
+        default: 'bg-transparent',
+        outline: 'border border-input bg-transparent hover:bg-accent hover:text-accent-foreground',
+      },
+      size: {
+        default: 'h-10 px-3',
+        sm: 'h-9 px-2.5',
+        lg: 'h-11 px-5',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+      size: 'default',
+    },
+  }
+);
+
+const Toggle = React.forwardRef<
+  React.ComponentRef<typeof TogglePrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof TogglePrimitive.Root> &
+    VariantProps<typeof toggleVariants>
+>(({ className, variant, size, ...props }, ref) => (
+  <TogglePrimitive.Root
+    ref={ref}
+    className={cn(toggleVariants({ variant, size, className }))}
+    {...props}
+  />
+));
+
+Toggle.displayName = TogglePrimitive.Root.displayName;
+
+export { Toggle, toggleVariants };