Update skills: add website-creator, mql-developer, ecommerce-astro

Changes:
- Add FAL_KEY and GEMINI_API_KEY to .env.example
- Update picture-it to use ~/.config/opencode/.env (unified creds)
- Remove shodh-memory skill (no longer used)
- Remove alphaear-* skills (deprecated)
- Remove thai-frontend-dev skill (replaced by website-creator)
- Remove theme-factory skill
- Add mql-developer skill (MQL5 trading)
- Add ecommerce-astro skill (Astro e-commerce)
- Add website-creator skill (Next.js + Payload CMS)
- Update install script for new skills

skills/website-creator/design/references/slides.md

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+# Slides Reference
+
+Strategic HTML presentation design with Chart.js data visualization, design tokens, responsive layouts, and copywriting formulas.
+
+## Usage
+
+Activate the `design` skill and specify slides task, e.g. "create a pitch deck".
+
+## Knowledge Base
+
+| Topic | File | Purpose |
+|-------|------|---------|
+| Creation Guide | `references/slides-create.md` | Step-by-step slide creation workflow |
+| Layout Patterns | `references/slides-layout-patterns.md` | Slide layout templates and grid systems |
+| HTML Template | `references/slides-html-template.md` | Base HTML structure for presentations |
+| Copywriting | `references/slides-copywriting-formulas.md` | AIDA, PAS, FAB for slide content |
+| Strategies | `references/slides-strategies.md` | Contextual strategies by presentation type |
+
+## When to Use
+
+- Marketing presentations and pitch decks
+- Data-driven slides with Chart.js visualizations
+- Strategic slide design with layout patterns
+- Copywriting-optimized presentation content
+- Investor decks, sales presentations, team updates
+
+## Key Features
+
+- **Chart.js Integration**: Bar, line, pie, doughnut, radar charts
+- **Design Tokens**: Consistent spacing, colors, typography
+- **Responsive**: Works on desktop and mobile
+- **Copywriting**: Built-in AIDA, PAS, FAB formulas
+- **Layout Patterns**: Hero, split, grid, comparison, timeline
+
+## Workflow
+
+1. Parse presentation type from user request
+2. Load `references/slides-create.md` for creation guide
+3. Select layout patterns from `references/slides-layout-patterns.md`
+4. Apply copywriting formulas from `references/slides-copywriting-formulas.md`
+5. Use HTML template from `references/slides-html-template.md`
+6. Apply strategy from `references/slides-strategies.md`