feat: bundle desktop skills

desktop/src-tauri/builtin-skills/seedance-prompt-en/SKILL.md

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+---
+name: seedance-prompt-en
+description: English Seedance 2.0 multimodal AI video prompt guide. Use for text/image/video/audio reference prompts with @Image, @Video, and @Audio syntax.
+---
+
+# Seedance 2.0 English Prompt Skill
+
+Use this skill when the user wants English prompts for Jimeng / Seedance 2.0 multimodal AI video generation.
+
+Upstream full skill: https://github.com/dexhunter/seedance2-skill
+
+## Reference Syntax
+
+Use explicit reference roles:
+
+- `@Image1 as the first frame`
+- `@Image1's character as the subject`
+- `scene references @Image2`
+- `reference @Video1's camera movement`
+- `BGM references @Audio1`
+
+## Prompt Blueprint
+
+```text
+[Subject setup] + [Scene/environment] + [Action/motion] + [Camera movement] + [Style/lighting] + [Audio/sound] + [Constraints]
+```
+
+Keep reference-heavy prompts precise. Say what each uploaded asset controls and what the model may invent.
+
+Install `dexhunter/seedance2-skill` from the Skills marketplace for the full guide.