feat: add auto-start, AFK mode, and comprehensive cross-platform setup

Major Features:
- Auto-start: MCP server now automatically starts Telegram bridge on demand
- AFK Mode: Toggle notifications on/off with /afk slash command
- New telegram_toggle_afk MCP tool for controlling notification state
- Dynamic enable/disable via new /toggle and /status API endpoints

MCP Server Improvements:
- Auto-detects if bridge is running and starts it automatically
- Monitors bridge process health and logs output
- Clean shutdown handling for both MCP server and bridge
- Process spawning with proper environment variable passing

Telegram Bridge Updates:
- Runtime toggle for ENABLED state (was previously static)
- POST /toggle endpoint to toggle notifications with Telegram confirmation
- GET /status endpoint to check current notification state
- Telegram messages sent when state changes (🟢/🔴 indicators)

Documentation:
- Cross-platform setup instructions (Mac, Linux, Windows)
- Claude Code CLI setup guide with claude mcp add commands
- Global vs project-specific MCP configuration explained
- Troubleshooting section for fixing configuration scope issues
- Complete AFK mode usage documentation
- All new API endpoints documented

Slash Commands:
- Created /afk command in .claude/commands/afk.md
- Available in both InnerVoice and ESO-MCP projects

Files Changed:
- src/mcp-server.ts: Auto-start logic and telegram_toggle_afk tool
- src/index.ts: Dynamic ENABLED toggle and new API endpoints
- README.md: Comprehensive setup and troubleshooting guide
- mcp-config.json: Updated with correct absolute path
- .claude/commands/afk.md: New slash command for AFK mode

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

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

.claude/commands/afk.md

@@ -0,0 +1,5 @@
+---
+description: Toggle InnerVoice AFK mode - enable/disable Telegram notifications
+---
+
+Use the `telegram_toggle_afk` MCP tool to toggle InnerVoice notifications. This controls whether you receive Telegram messages while away from your system.