feat: Add shadcn worker UI

worker/README.md

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+# MeshCore SAR RX Stats Worker
+
+This worker follows the same split as `/Users/dz0ny/site-vendorvigilance`:
+
+- Astro builds the dashboard UI into `dist`
+- a small Cloudflare Worker handles `/api/*` before assets are served
+
+## Layout
+
+- `src/pages/index.astro` - dashboard shell
+- `worker/index.ts` - Cloudflare Worker entrypoint
+- `worker/stats.ts` - D1 queries, payload validation, and aggregation helpers
+- `schema.sql` - D1 schema
+
+## Setup
+
+1. Install dependencies with `bun install`.
+2. Create a D1 database with `bunx wrangler d1 create meshcore_sar_rx_stats`.
+3. Apply the schema with `bunx wrangler d1 execute meshcore_sar_rx_stats --remote --file=./schema.sql`.
+4. Add the real D1 binding id to `wrangler.toml` when deploying.
+5. Build the dashboard with `bun run build`.
+6. Run checks with `bun run check`, `bun run test`, and `bun run typecheck`.
+
+## Routes
+
+- `GET /` - static Astro dashboard
+- `GET /api/dashboard?window=24h|7d|30d` - aggregated dashboard JSON
+- `POST /api/ingest` - anonymous RX stats ingest