Add 260+ Claude Code skills from skills.sh

Complete collection of AI agent skills including:
- Frontend Development (Vue, React, Next.js, Three.js)
- Backend Development (NestJS, FastAPI, Node.js)
- Mobile Development (React Native, Expo)
- Testing (E2E, frontend, webapp)
- DevOps (GitHub Actions, CI/CD)
- Marketing (SEO, copywriting, analytics)
- Security (binary analysis, vulnerability scanning)
- And many more...

Synchronized from: https://skills.sh/

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

performance-profiling/skill.md

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+---
+name: performance-profiling
+description: Performance profiling principles. Measurement, analysis, and optimization techniques.
+allowed-tools: Read, Glob, Grep, Bash
+---
+
+# Performance Profiling
+
+> Measure, analyze, optimize - in that order.
+
+## 🔧 Runtime Scripts
+
+**Execute these for automated profiling:**
+
+| Script | Purpose | Usage |
+|--------|---------|-------|
+| `scripts/lighthouse_audit.py` | Lighthouse performance audit | `python scripts/lighthouse_audit.py https://example.com` |
+
+---
+
+## 1. Core Web Vitals
+
+### Targets
+
+| Metric | Good | Poor | Measures |
+|--------|------|------|----------|
+| **LCP** | < 2.5s | > 4.0s | Loading |
+| **INP** | < 200ms | > 500ms | Interactivity |
+| **CLS** | < 0.1 | > 0.25 | Stability |
+
+### When to Measure
+
+| Stage | Tool |
+|-------|------|
+| Development | Local Lighthouse |
+| CI/CD | Lighthouse CI |
+| Production | RUM (Real User Monitoring) |
+
+---
+
+## 2. Profiling Workflow
+
+### The 4-Step Process
+
+```
+1. BASELINE → Measure current state
+2. IDENTIFY → Find the bottleneck
+3. FIX → Make targeted change
+4. VALIDATE → Confirm improvement
+```
+
+### Profiling Tool Selection
+
+| Problem | Tool |
+|---------|------|
+| Page load | Lighthouse |
+| Bundle size | Bundle analyzer |
+| Runtime | DevTools Performance |
+| Memory | DevTools Memory |
+| Network | DevTools Network |
+
+---
+
+## 3. Bundle Analysis
+
+### What to Look For
+
+| Issue | Indicator |
+|-------|-----------|
+| Large dependencies | Top of bundle |
+| Duplicate code | Multiple chunks |
+| Unused code | Low coverage |
+| Missing splits | Single large chunk |
+
+### Optimization Actions
+
+| Finding | Action |
+|---------|--------|
+| Big library | Import specific modules |
+| Duplicate deps | Dedupe, update versions |
+| Route in main | Code split |
+| Unused exports | Tree shake |
+
+---
+
+## 4. Runtime Profiling
+
+### Performance Tab Analysis
+
+| Pattern | Meaning |
+|---------|---------|
+| Long tasks (>50ms) | UI blocking |
+| Many small tasks | Possible batching opportunity |
+| Layout/paint | Rendering bottleneck |
+| Script | JavaScript execution |
+
+### Memory Tab Analysis
+
+| Pattern | Meaning |
+|---------|---------|
+| Growing heap | Possible leak |
+| Large retained | Check references |
+| Detached DOM | Not cleaned up |
+
+---
+
+## 5. Common Bottlenecks
+
+### By Symptom
+
+| Symptom | Likely Cause |
+|---------|--------------|
+| Slow initial load | Large JS, render blocking |
+| Slow interactions | Heavy event handlers |
+| Jank during scroll | Layout thrashing |
+| Growing memory | Leaks, retained refs |
+
+---
+
+## 6. Quick Win Priorities
+
+| Priority | Action | Impact |
+|----------|--------|--------|
+| 1 | Enable compression | High |
+| 2 | Lazy load images | High |
+| 3 | Code split routes | High |
+| 4 | Cache static assets | Medium |
+| 5 | Optimize images | Medium |
+
+---
+
+## 7. Anti-Patterns
+
+| ❌ Don't | ✅ Do |
+|----------|-------|
+| Guess at problems | Profile first |
+| Micro-optimize | Fix biggest issue |
+| Optimize early | Optimize when needed |
+| Ignore real users | Use RUM data |
+
+---
+
+> **Remember:** The fastest code is code that doesn't run. Remove before optimizing.