docs: Update marketplace URL format to full GitHub URL

- Update plugin marketplace add command from 'daymade/claude-code-skills' to full GitHub URL
- Add marketplace name clarification (daymade-skills from marketplace.json)
- Update all plugin install commands to use @daymade-skills suffix
- Standardize marketplace references across all documentation files
- Update installation scripts to use new URL format

Affected files:
- CLAUDE.md: Development commands and skill creation workflow
- CONTRIBUTING.md: Contribution guidelines
- QUICKSTART.md: Quick start guide
- QUICKSTART.zh-CN.md: Chinese quick start guide
- README.md: Main documentation
- README.zh-CN.md: Chinese documentation
- demos/index.html: Demo page
- scripts/install.ps1: Windows installation script
- scripts/install.sh: Unix installation script

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

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

scripts/install.ps1

@@ -66,14 +66,14 @@ if ($isInteractive) {
 }
 
 $commands = @()
-$commands += "claude plugin marketplace add daymade/claude-code-skills"
+$commands += "claude plugin marketplace add https://github.com/daymade/claude-code-skills"
 
 switch ($choice) {
     "1" {
         Write-Host ""
         Write-Cyan "Installing skill-creator..."
         Write-Host ""
-        $commands += "claude plugin install skill-creator@daymade/claude-code-skills"
+        $commands += "claude plugin install skill-creator@daymade-skills"
 
         $afterInstall = @"
 After installation, ask Claude Code:
@@ -91,7 +91,7 @@ Claude Code will guide you through the skill creation process!
         $skills = @("skill-creator", "github-ops", "markdown-tools", "mermaid-tools",
                     "statusline-generator", "teams-channel-post-writer", "repomix-unmixer", "llm-icon-finder")
         foreach ($skill in $skills) {
-            $commands += "claude plugin install $skill@daymade/claude-code-skills"
+            $commands += "claude plugin install $skill@daymade-skills"
         }
     }
     "3" {
@@ -127,7 +127,7 @@ Claude Code will guide you through the skill creation process!
 
         foreach ($num in $selections) {
             if ($skillMap.ContainsKey($num)) {
-                $commands += "claude plugin install $($skillMap[$num])@daymade/claude-code-skills"
+                $commands += "claude plugin install $($skillMap[$num])@daymade-skills"
             }
         }
     }