feat(server): build axum web server for licensing, landing page, and updates

server/README.md

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+# CleanCopy Server
+
+Axum web backend for CleanCopy. Handles license activation, Stripe webhooks, release downloads, and the Tauri updater endpoint.
+
+## Routes
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | `/` | Landing page |
+| GET | `/docs` | Documentation |
+| GET | `/docs/terms` | Terms of Service |
+| GET | `/docs/refunds` | Refund Policy |
+| GET/POST | `/api/activate` | License activation (Ed25519 signing) |
+| POST | `/api/webhook` | Stripe webhook handler |
+| GET | `/releases/download/{version}/{arch}` | Release binary download |
+| GET | `/updates/{target}/{arch}/{version}.json` | Tauri updater manifest |
+| GET | `/healthz` | Health check |
+
+## Local Development
+
+```bash
+cargo run -p clean-copy-server
+```
+
+Server listens on `0.0.0.0:3000`.
+
+## Docker
+
+```bash
+docker build -t clean-copy-server .
+docker run -p 3000:3000 clean-copy-server
+```