docs: add comprehensive testing checklist and update setup instructions

CLAUDE.md updates:
- Add "Reference Repository (Required for Development)" section
- Include instructions for cloning FlashForgeUI-Electron reference repo
- Document when and why to use the reference repository
- Clarify that reference repo is read-only and gitignored

SUMMARY_AND_REVIEW.md (NEW - 850+ lines):
Comprehensive implementation summary and testing checklist covering:

Implementation Summary:
- Executive summary with stats (150+ files, 50K+ LOC, 324 compiled files)
- Phase-by-phase completion status (Phases 1-5, 100% complete)
- Detailed file listings with sizes and purposes
- Build & compilation status
- Runtime usage & CLI examples

Testing Checklist (7 Phases):
1. Pre-Flight Checks - Environment, dependencies, build verification
2. Server Startup Tests - Basic startup, WebUI accessibility, custom configs
3. Printer Connection Tests - All 4 connection modes, error handling
4. WebUI Functional Tests - Auth, WebSocket, status, controls, jobs, camera,
   Spoolman, multi-printer, GridStack, themes (60+ test items)
5. Backend Service Tests - Polling, state monitors, camera proxy, RTSP,
   Spoolman services (40+ test items)
6. Error Handling & Edge Cases - Startup errors, runtime errors, config errors,
   network errors, browser compatibility (25+ test items)
7. Performance & Stability Tests - Memory leaks, concurrent clients, multiple
   printers, large files, graceful shutdown (15+ test items)

Additional Sections:
- Known issues & limitations (documented)
- Potential issues to monitor
- Verification commands (pre-testing, smoke test)
- Next steps for testing session (prioritized)
- Success criteria checklist
- Commit history summary
- Final notes and estimated testing time

Total Testing Items: 140+ individual verification checkboxes
Purpose: Comprehensive testing guide for next session to ensure production-ready
quality before user tests tonight.

Author: claude

CLAUDE.md

@@ -80,16 +80,34 @@ ls -la node_modules/@parallel-7/slicer-meta
 # Both should be symlinks pointing to .dependencies/
 ```
 
-## Reference Repository
+## Reference Repository (Required for Development)
 
-The source FlashForgeUI-Electron repository is cloned at:
-```
-/home/user/FlashForgeWebUI/FlashForgeUI-Electron
+The source FlashForgeUI-Electron repository must be cloned for reference during development. This repository contains the original implementation that we're porting from.
+
+### Cloning the Reference Repository
+
+If the FlashForgeUI-Electron directory doesn't exist, clone it:
+
+```bash
+cd /home/user/FlashForgeWebUI
+git clone https://github.com/Parallel-7/FlashForgeUI-Electron.git
+cd FlashForgeUI-Electron
+git checkout alpha
+cd ..
 ```
 
+**Expected location:** `/home/user/FlashForgeWebUI/FlashForgeUI-Electron`
 **Branch:** alpha
+**Important:** This directory is gitignored in the main project and should NOT be deleted during development.
+
+### When to Use the Reference Repository
+
+- **Phase 1-5**: Reference specific implementations from the source files
+- **Debugging**: Compare implementations when issues arise
+- **Feature parity**: Ensure 1:1 functionality match with original WebUI
+- **Type definitions**: Check original type structures and interfaces
 
-**DO NOT delete this directory** - it contains the source code we're porting from.
+The reference repository is read-only and should not be modified. All development happens in the main FlashForgeWebUI directory.
 
 ## Important Notes