Add cli-demo-generator skill (9th skill)

- Created comprehensive CLI demo generation skill with VHS automation
- Three approaches: automated, batch, and interactive recording
- Smart timing based on command complexity
- Complete documentation with VHS syntax reference and best practices
- Templates and examples for quick start
- Updated marketplace.json to v1.3.0
- Updated README.md and README.zh-CN.md with new skill
- Added to CHANGELOG.md

Skill features:
- auto_generate_demo.py: Automated generation from command lists
- batch_generate.py: Batch processing with YAML/JSON configs
- record_interactive.sh: Interactive recording with asciinema
- VHS tape file templates and examples
- 346-line SKILL.md following Anthropic best practices
- Grade A- in best practices review

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

cli-demo-generator/assets/examples/batch-config.yaml

@@ -0,0 +1,31 @@
+# Example batch configuration for generating multiple demos
+# Usage: batch_generate.py batch-config.yaml --output-dir ./output
+
+demos:
+  - name: "Installation Demo"
+    output: "install.gif"
+    title: "Package Installation"
+    theme: "Dracula"
+    width: 1400
+    height: 700
+    commands:
+      - "npm install my-package"
+      - "npm run build"
+
+  - name: "Usage Demo"
+    output: "usage.gif"
+    title: "Basic Usage"
+    theme: "Nord"
+    commands:
+      - "my-package --help"
+      - "my-package init"
+      - "my-package run"
+
+  - name: "Quick Start"
+    output: "quickstart.gif"
+    theme: "Tokyo Night"
+    commands:
+      - "git clone https://github.com/user/repo.git"
+      - "cd repo"
+      - "npm install"
+      - "npm start"