Clean up all remaining /reboot references from documentation

- Remove reboot from README.md high priority section and API table
- Remove reboot from PLAN.md Phase 3 endpoints list
- Update README to reflect completion of all high priority endpoints
- Clarify that all available API functionality is now implemented

/reboot was never part of the official Bose SoundTouch API and was incorrectly assumed to exist.

docs/PLAN.md

@@ -376,7 +376,6 @@ func (c Config) Validate() error
   - GET/POST /clockTime - Device time management
   - GET/POST /clockDisplay - Clock display settings
   - GET /networkInfo - Network diagnostics
-  - POST /reboot - Device restart
 
 ### Phase 4: WebSocket Real-time Events 📡
 - [ ] **Implement WebSocket Client**

docs/STATUS.md

@@ -64,7 +64,7 @@ This project implements a comprehensive Go client library and CLI tool for Bose
 
 
 ### **Remaining Endpoints - LOW PRIORITY**
-- ❌ `POST /reboot` - **Not available in official SoundTouch API**
+- None - all available endpoints implemented
 
 ### **✅ Recently Completed**
 - `GET /clockTime`, `POST /clockTime` - Device time ✅ Complete
@@ -202,7 +202,7 @@ This project implements a comprehensive Go client library and CLI tool for Bose
 ## 🎯 Current Focus Areas
 
 ### Immediate Next Steps (1-2 Sessions)
-1. **Additional System Diagnostics** - Extended device health monitoring
+1. **Documentation & Examples** - Comprehensive usage examples and guides
 
 ### Short Term (3-5 Sessions)
 4. **Error Enhancement** - More detailed error responses