Add README, plugin citations, and multi-platform release CI.

Ship screenshots and third-party notices for the desktop shell, and
package Windows, macOS, deb, rpm, and Flatpak from GitHub Releases.

Co-authored-by: Cursor <cursoragent@cursor.com>

THIRD_PARTY.md

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+# Third-party notices
+
+DeepSeek Harness Desktop (this repository) is MIT-licensed. It is a native
+shell around other projects. Those projects keep their own copyright and
+license. Copies of the relevant texts live in `docs/licenses/`.
+
+This project is **not** affiliated with, endorsed by, or maintained by
+DeepSeek, liustack, or xiaobright.
+
+## Bundled or launched at runtime
+
+| Component | Upstream | Version / pin | License | How this app uses it |
+| --- | --- | --- | --- | --- |
+| DeepSeek Harness (`@deepseek-ai/dsh`) | [deepseek-ai/deepseek-harness](https://github.com/deepseek-ai/deepseek-harness) | `0.1.0-rc.6` | MIT, © 2026 DeepSeek | Official WebUI. Not shipped as source. Flatpak vendors the npm package; other packages call a host `dsh`. See `docs/licenses/deepseek-harness.LICENSE`. |
+| ModLens (`@liustack/modlens`) | [liustack/modlens](https://github.com/liustack/modlens) | `3.16.6` | MIT, © 2026 Leon Liu (liustack) | Copied into `~/.dsh/profiles/web` so text-only models can read images. See `docs/licenses/modlens.LICENSE`. |
+| Anchored Standard | [xiaobright/dsh-anchored-standard](https://github.com/xiaobright/dsh-anchored-standard) | commit `ffb845c5480adc953392a6db6f8a98ede621174b` | MIT, © 2026 xiaobright; portions © 2026 DeepSeek | Localized as **锚定式标准（实验）** and **零工具锚定式标准（实验）**, written to `~/.dsh/.agent-presets/`. See `docs/licenses/dsh-anchored-standard.LICENSE` and `.NOTICE`. |
+| `dsh-desktop-vision` | this repo `plugins/dsh-desktop-vision/` | `0.1.4` | MIT, © 2026 TommyFang2077 | Settings page **设置 → 视觉模型**; writes `~/.modlens/config.json`. |
+
+The Anchored Standard NOTICE records that the presets adapt the DeepSeek
+Harness Standard agent preset from
+https://github.com/deepseek-ai/deepseek-harness
+(commit `47f943859bef60e4160492346772ded9b24f765a`).
+
+## App icon
+
+The application icon is the [Icons8 DeepSeek icon](https://icons8.com/icon/YWOidjGxCpFW/deepseek).
+DeepSeek and the whale mark belong to their owners.
+
+## Tauri and system WebView
+
+The window is built with [Tauri 2](https://tauri.app/) (MIT / Apache-2.0) and
+the platform WebView (WebKitGTK 4.1, WKWebView, or WebView2). Those components
+are linked or bundled by the respective platform toolchains, not copied into
+this source tree.