feat: restore all 30 slash commands with comprehensive documentation

Restored 26 additional commands from commit d4a17fc, bringing total from 5 to 30 commands.

## New Commands Added (26):
- /analyze - Code and architecture analysis
- /brainstorm - Structured brainstorming sessions
- /build - Build and compilation workflows
- /business-panel - Multi-expert business analysis
- /cleanup - Code cleanup and refactoring
- /design - System design and architecture
- /document - Documentation generation
- /estimate - Effort and time estimation
- /explain - Code explanation
- /git - Git operations and workflows
- /help - Command help and usage
- /implement - Implementation workflows
- /improve - Code improvement suggestions
- /index - Project indexing (alias for index-repo)
- /load - Load saved sessions
- /pm - Project management workflows
- /reflect - Reflection and retrospectives
- /save - Save current session
- /select-tool - Tool selection guidance
- /spawn - Spawn parallel tasks
- /spec-panel - Multi-expert specification analysis
- /task - Task management
- /test - Testing workflows
- /troubleshoot - Debugging and troubleshooting
- /workflow - Custom workflow automation

## Documentation Updates:
- Created docs/reference/commands-list.md with categorized command reference
- Updated README.md with expandable 30-command list
- Updated README-zh.md with Chinese translations
- Updated README-ja.md with Japanese translations
- Updated README-kr.md with Korean translations
- Changed statistics: "3 plugins" → "30 commands"
- Added command categories: Planning & Design, Development, Testing & Quality,
  Documentation, Version Control, Project Management, Research & Analysis, Utilities

## Files Changed:
- 60 files changed, 7930 insertions(+), 267 deletions(-)
- Added 26 commands to plugins/superclaude/commands/
- Added 26 commands to src/superclaude/commands/
- Created comprehensive command documentation

Commands restored from: d4a17fc (superclaude/commands/)
Total: 30 commands now available

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

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

docs/reference/commands-list.md

@@ -0,0 +1,80 @@
+# SuperClaude Commands Reference
+
+Complete list of all 30 slash commands available in SuperClaude Framework v4.1.8+
+
+## Command Categories
+
+### 🧠 Planning & Design
+- **`/brainstorm`** - Structured brainstorming sessions with multiple perspectives
+- **`/design`** - System design and architecture planning
+- **`/estimate`** - Effort and time estimation for tasks
+- **`/spec-panel`** - Multi-expert specification analysis
+
+### 💻 Development
+- **`/implement`** - Code implementation workflows
+- **`/build`** - Build and compilation workflows
+- **`/improve`** - Code improvement suggestions
+- **`/cleanup`** - Code cleanup and refactoring
+- **`/explain`** - Code explanation and documentation
+
+### 🧪 Testing & Quality
+- **`/test`** - Testing workflows and test generation
+- **`/analyze`** - Code and architecture analysis
+- **`/troubleshoot`** - Debugging and troubleshooting
+- **`/reflect`** - Reflection and retrospectives
+
+### 📚 Documentation
+- **`/document`** - Documentation generation
+- **`/help`** - Command help and usage information
+
+### 🔧 Version Control
+- **`/git`** - Git operations and workflows
+
+### 📊 Project Management
+- **`/pm`** - Project management workflows
+- **`/task`** - Task management and tracking
+- **`/workflow`** - Custom workflow automation
+
+### 🔍 Research & Analysis
+- **`/research`** - Deep web research with parallel search
+- **`/business-panel`** - Multi-expert business analysis
+
+### 🎯 Utilities
+- **`/agent`** - Specialized AI agents
+- **`/index-repo`** - Repository indexing for context optimization
+- **`/index`** - Alias for /index-repo
+- **`/recommend`** - Command recommendations
+- **`/select-tool`** - Tool selection guidance
+- **`/spawn`** - Spawn parallel tasks
+- **`/load`** - Load saved sessions
+- **`/save`** - Save current session
+- **`/sc`** - Show all available SuperClaude commands
+
+## Usage
+
+All commands are available with the `/sc:` namespace prefix:
+
+```bash
+# Examples
+/sc:brainstorm "How to improve user authentication"
+/sc:implement "Add JWT authentication"
+/sc:test "Generate tests for auth module"
+/sc:research "Latest security best practices"
+```
+
+## Installation
+
+```bash
+# Install all 30 commands
+superclaude install
+
+# List installed commands
+superclaude install --list
+
+# Update to latest
+superclaude update
+```
+
+## Command Help
+
+Use `/sc:help` to get detailed information about any command, or `/sc` to see all available commands.