Add user guide, self-hosting, API, and contributing docs

docs/user-guide.md — magic-link sign-in, note basics, wikilink syntax, keyboard shortcuts, offline behaviour, and privacy notes (sessionStorage for tokens, tenant-scoped localStorage). docs/self-hosting.md — system requirements, Docker Compose quick-start, the full LIBRENOTES_* env-var matrix (which are required, which conditional), reverse proxy snippets for Caddy and nginx, volume layout, the in-binary healthcheck, and update/rollback procedure. docs/api.md — every public endpoint: auth (login/verify), notes CRUD, /api/whoami, /healthz. Status codes per endpoint, the optimistic-locking ?base=<unix> contract for PUT/DELETE, note-ID regex, and the rate-limit policy. CONTRIBUTING.md — dev setup (Nix flake .#dev, plain Go, Docker), package layout overview, coding standards (one-way dep flow, tenant FS gateway requirement), branch naming, commit format, and the PR process. Also points security reports at security@librete.ch rather than public issues. Closes #29. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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+# Self-hosting
+
+This guide explains how to run your own librenotes instance with
+Docker Compose. For day-2 ops (deploys, backups) see
+[operations.md](./operations.md).
+
+## System requirements
+
+- Linux server with Docker Engine 24+ and the Compose plugin.
+- At least 256 MB of RAM and 1 GB of disk for the application
+  plus whatever space you expect notes to consume (typically
+  measured in MB even for heavy users).
+- A public DNS name pointing to the host. Magic-link sign-in will
+  not work over plain IP because some email clients refuse to
+  follow links to bare-IP URLs.
+- An SMTP relay (or a service like Postmark/SES) that the host
+  can reach on port 587 or 465.
+- A reverse proxy (nginx, Caddy, or Traefik) terminating TLS in
+  front of librenotes.
+
+## Quick start
+
+```sh
+git clone https://git.librete.ch/public/librenotes
+cd librenotes
+cp .env.example .env  # edit values, see below
+docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
+```
+
+Visit `https://your-domain/` and sign in.
+
+## Environment configuration
+
+The runtime reads its configuration from environment variables.
+Place them in an `.env` file next to the Compose stack.
+
+| Variable | Required | Description |
+| -------- | -------- | ----------- |
+| `LIBRENOTES_BASE_URL` | yes | Public origin used in magic links, e.g. `https://notes.example.com`. Must match what users will type. |
+| `LIBRENOTES_JWT_SECRET` | yes | At least 32 bytes of random data. Sessions are invalidated when this changes. |
+| `LIBRENOTES_SMTP_HOST` | yes (prod) | SMTP server hostname. Without it, magic links are logged to stdout (useful for dev only). |
+| `LIBRENOTES_SMTP_PORT` | no | Default `587`. |
+| `LIBRENOTES_SMTP_USER` | conditional | SMTP credential. |
+| `LIBRENOTES_SMTP_PASS` | conditional | SMTP credential. |
+| `LIBRENOTES_SMTP_FROM` | yes | Envelope sender, e.g. `no-reply@notes.example.com`. |
+| `LIBRENOTES_DATA_DIR` | no | Default `/data` inside the container. |
+| `LIBRENOTES_DB` | no | Default `/var/lib/librenotes/librenotes.db`. |
+| `LIBRENOTES_IMAGE` | yes (prod) | Image tag to pull, e.g. `registry.librete.ch/librenotes:v0.1.0`. |
+
+Generate a JWT secret:
+
+```sh
+openssl rand -hex 32
+```
+
+## Reverse proxy
+
+### Caddy
+
+```caddy
+notes.example.com {
+    encode zstd gzip
+    reverse_proxy localhost:8080
+}
+```
+
+### Nginx
+
+```nginx
+server {
+    listen 443 ssl http2;
+    server_name notes.example.com;
+
+    ssl_certificate     /etc/letsencrypt/live/notes.example.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/notes.example.com/privkey.pem;
+
+    location / {
+        proxy_pass http://127.0.0.1:8080;
+        proxy_set_header Host              $host;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-For   $remote_addr;
+    }
+}
+```
+
+The application speaks plain HTTP and trusts the proxy for the
+public URL via `LIBRENOTES_BASE_URL`. Always terminate TLS at the
+proxy.
+
+## Volumes
+
+The Compose stack declares two named volumes:
+
+- `notes` mounted at `/data` — per-tenant note files.
+- `state` mounted at `/var/lib/librenotes` — the SQLite database.
+
+Both must be on persistent storage. Backing them up is covered
+in [operations.md](./operations.md#backups).
+
+## Health check
+
+`GET /healthz` returns `{"status":"ok"}` when the binary is
+running. The Compose stacks invoke `librenotes healthcheck` from
+inside the container (since the runtime image has no shell tools
+to use `curl`/`wget`).
+
+## Updating
+
+Pull the new image and restart:
+
+```sh
+docker compose -f docker-compose.yml -f docker-compose.prod.yml pull
+docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
+```
+
+To pin a specific version, set `LIBRENOTES_IMAGE` to that tag in
+`.env`. Rolling back is the same command after editing `.env`.