feat: add flat-doodle style to cover-image and article-illustrator

Add new flat-doodle style featuring:
- Bold black outlines
- Bright pastel colors (pink, mint, lavender, yellow)
- Simple flat shapes with cute rounded proportions
- White background
- Best for productivity, SaaS, workflow content

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

skills/baoyu-article-illustrator/SKILL.md

@@ -45,6 +45,7 @@ Analyze article structure and content, identify positions requiring visual aids,
 | `chalkboard` | Classroom chalk drawing style | Education, tutorials, workshops |
 | `editorial` | Magazine-style infographic | Tech explainers, journalism |
 | `flat` | Modern flat vector illustration | Startups, digital, contemporary |
+| `flat-doodle` | Bold outlines, pastel colors, cute | Productivity, SaaS, workflows |
 | `retro` | 80s/90s vibrant nostalgic | Pop culture, gaming, entertainment |
 | `blueprint` | Technical schematics, engineering precision | Architecture, system design |
 | `vector-illustration` | Flat vector with black outlines, retro colors | Educational, creative, brand content |
@@ -74,6 +75,7 @@ When no `--style` is specified, analyze content to select the best style:
 | Education, classroom, teaching, school, lecture, workshop | `chalkboard` |
 | Explainer, journalism, magazine, in-depth, investigation | `editorial` |
 | Modern, startup, app, product, digital marketing, saas | `flat` |
+| Productivity, workflow, cute, tools, app tutorial | `flat-doodle` |
 | 80s, 90s, retro, pop culture, music, nostalgia | `retro` |
 | Architecture, system, infrastructure, engineering, technical | `blueprint` |
 | Brand, explainer, children, cute, toy, geometric | `vector-illustration` |

skills/baoyu-article-illustrator/references/styles/flat-doodle.md

@@ -0,0 +1,61 @@
+# flat-doodle
+
+Cute flat doodle illustration style with bold outlines
+
+## Design Aesthetic
+
+Cheerful and approachable visual style combining flat design with doodle charm. Features bold black outlines around simple shapes. Bright pastel colors with no gradients or shading. Cute rounded proportions that feel friendly. Clean white backgrounds create focus and clarity.
+
+## Background
+
+- Color: Clean White (#FFFFFF)
+- Texture: None - pure white isolated background
+
+## Color Palette
+
+| Role | Color | Hex | Usage |
+|------|-------|-----|-------|
+| Background | White | #FFFFFF | Primary background |
+| Primary | Pastel Pink | #FFB6C1 | Main elements |
+| Secondary | Mint | #98D8C8 | Supporting elements |
+| Tertiary | Lavender | #C8A2C8 | Accent elements |
+| Accent 1 | Butter Yellow | #FFFACD | Highlight pop |
+| Accent 2 | Sky Blue | #87CEEB | Cool accent |
+| Accent 3 | Soft Coral | #F88379 | Warm accent |
+| Outline | Bold Black | #000000 | All outlines |
+| Text | Black | #1A1A1A | Text elements |
+
+## Visual Elements
+
+- Bold black outlines around all shapes
+- Simple flat color fills
+- Cute rounded proportions
+- Minimal geometric shapes
+- Productivity icons (laptops, calendars, checkmarks)
+- Isolated elements on white
+- No shading or gradients
+- Hand-drawn quality with clean edges
+
+## Style Rules
+
+### Do
+
+- Use bold black outlines consistently
+- Keep shapes simple and rounded
+- Use bright pastel palette
+- Isolate elements on white background
+- Maintain cute proportions
+- Keep minimal shading
+
+### Don't
+
+- Add shadows or depth effects
+- Use gradients or textures
+- Create complex detailed illustrations
+- Overlap too many elements
+- Use dark or moody backgrounds
+- Add realistic proportions
+
+## Best For
+
+Productivity articles, SaaS and app content, workflow tutorials, beginner guides, casual business content, tool introductions, lifestyle productivity

skills/baoyu-cover-image/SKILL.md

@@ -47,6 +47,7 @@ Generate hand-drawn style cover images for articles with multiple style options.
 | Style | Description |
 |-------|-------------|
 | `elegant` (Default) | Refined, sophisticated, understated |
+| `flat-doodle` | Bold outlines, pastel colors, cute rounded shapes |
 | `blueprint` | Technical schematics, engineering precision |
 | `bold-editorial` | Magazine cover impact, dramatic typography |
 | `chalkboard` | Black chalkboard, colorful chalk drawings |
@@ -87,6 +88,7 @@ When no `--style` is specified, the system analyzes content to select the best s
 | Nature, eco, wellness, health, organic | `nature` |
 | Pop culture, 80s/90s nostalgia, badges | `retro` |
 | Product, SaaS, dashboard, productivity | `notion` |
+| Productivity, workflow, app, tools, cute | `flat-doodle` |
 | Gaming, retro tech, developer, 8-bit | `pixel-art` |
 | Educational, tutorial, knowledge sharing | `sketch-notes` |
 | Creative proposals, brand, toy-like | `vector-illustration` |

skills/baoyu-cover-image/references/styles/flat-doodle.md

@@ -0,0 +1,27 @@
+# flat-doodle
+
+Cute, simple doodle illustrations with bold outlines
+
+## Color Palette
+
+- Primary: Bright pastel pink (#FFB6C1), mint (#98D8C8), lavender (#C8A2C8), butter yellow (#FFFACD)
+- Background: Clean white (#FFFFFF)
+- Accents: Bold black outlines, soft coral, sky blue
+
+## Visual Elements
+
+- Bold black outlines around all shapes
+- Simple flat shapes with no shading
+- Cute rounded proportions
+- Productivity-themed icons
+- Isolated elements on white background
+- Minimal decorative details
+
+## Typography
+
+- Simple, clean sans-serif or hand-lettering
+- Bold and easily readable
+
+## Best For
+
+Productivity content, SaaS articles, workflow tutorials, app features, beginner guides, casual business