docs+release: Phase 4 launch artifacts

README hero with real screenshots, install/config/widget docs, goreleaser
for dash + dash-agent, GHCR release workflow, changelog, community files,
agent systemd unit and Dockerfile, version stamping via -X main.version.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

README.md

@@ -3,21 +3,69 @@
 A self-hosted homelab dashboard. CasaOS-grade ease of use, Vercel-grade design.
 Single container, UI-managed, no YAML, no auth.
 
-**Status:** pre-release. See [ROADMAP.md](ROADMAP.md).
+![Dash board](docs/screenshots/board.png)
+
+## Features
+
+- **Service board** — sections, drag-and-drop, multi-URL services, icon upload,
+  four board renderers (Bento, Cards, Index, Console), dark/light themes
+- **Uptime monitors** — HTTP, TCP, ping, DNS, keyword, JSON-path, and push
+  checks on a schedule, with heartbeat history and uptime stats
+- **Domain watch** — WHOIS/RDAP, DNS records, TLS certificate expiry,
+  registrar and provider detection
+- **System monitoring** — lightweight `dash-agent` pushes CPU, memory, disk,
+  network, load, temperatures, and Docker container state
+- **Incidents & status pages** — manual and automatic incidents, maintenance
+  windows, public `/status/:slug` pages, SVG badges
+- **Alerts** — generic webhook notifications (Slack, Discord, ntfy compatible)
+- **Observability** — Prometheus `/api/metrics`, JSON export, CSV bulk import,
+  importers for Homepage, Homarr, and Dashy configs
 
 ## Run
 
 ```sh
-docker run -v ./data:/data -p 3000:3000 dash
+docker run -d -v ./data:/data -p 3000:3000 ghcr.io/dvorinka/dash:latest
 ```
 
-or
+or with compose:
+
+```yaml
+services:
+  dash:
+    image: ghcr.io/dvorinka/dash:latest
+    ports:
+      - "3000:3000"
+    volumes:
+      - ./data:/data
+    restart: unless-stopped
+```
+
+Then open http://localhost:3000. Everything is configured from the UI.
+
+## System agent
+
+Monitor a Linux host: create a system in the UI, copy the token, then:
 
 ```sh
-docker compose up
+dash-agent -url http://dash:3000 -token <token>
 ```
 
-Then open http://localhost:3000.
+One static binary, no dependencies. See
+[docs/installation.md](docs/installation.md) for systemd and Docker setups.
+
+## Screenshots
+
+| | |
+|---|---|
+| ![Monitors](docs/screenshots/monitors.png) | ![Domains](docs/screenshots/domains.png) |
+| ![Systems](docs/screenshots/systems.png) | ![Status page](docs/screenshots/status-page.png) |
+
+## Docs
+
+- [Installation](docs/installation.md)
+- [Configuration](docs/configuration.md)
+- [Widget development](docs/widgets.md)
+- [Roadmap](ROADMAP.md) · [Changelog](CHANGELOG.md) · [Contributing](CONTRIBUTING.md)
 
 ## Develop