docs: add legacy port clarification to website documentation

Legacy Port Clarification - Complete:
✅ LEGACY PORT DOCUMENTATION: Added clear notes about legacy vs current ports
- website/docs/flowchart.html: Added note about 18000/18001 → 8000/8010 migration
- website/docs/api.html: Added legacy port notes for HTTP and WebSocket APIs
- Reason: Documentation now clearly distinguishes between legacy and current ports

✅ LEGACY VS CURRENT PORTS:
❌ Legacy Ports (No Longer Used):
  - 18000: Legacy Coordinator API
  - 18001: Legacy Miner/GPU Service
  - 26657: Legacy Blockchain RPC
  - 18001: Legacy WebSocket

✅ Current Ports (8000-8029 Range):
  - 8000: Coordinator API (current)
  - 8006: Blockchain RPC (current)
  - 8010: GPU Service (current)
  - 8015: AI Service/WebSocket (current)

✅ DOCUMENTATION IMPROVEMENTS:
📊 Flowchart: Added legacy port migration note
🔗 API Docs: Added legacy port replacement notes
🌐 WebSocket: Updated from legacy 18001 to current 8015
📚 Clarity: Users can distinguish old vs new architecture

✅ USER EXPERIENCE:
✅ Clear Migration Path: Documentation shows port evolution
✅ No Confusion: Legacy vs current ports clearly marked
✅ Developer Guidance: Current ports properly highlighted
✅ Historical Context: Legacy architecture acknowledged

✅ PORT MIGRATION COMPLETE:
✅ All References: Updated to current port scheme
✅ Legacy Notes: Added for historical context
✅ Documentation Consistency: Website matches current deployment
✅ Developer Resources: Clear guidance on current ports

RESULT: Successfully added legacy port clarification to website documentation. The documentation now clearly distinguishes between legacy ports (18000/18001) and current ports (8000-8029), helping developers understand the port migration and use the correct current endpoints.

website/docs/flowchart.html

@@ -55,6 +55,9 @@
                     </div>
                     <div style="font-size: 0.85rem; color: #64748b; text-align: center; margin-top: 1rem;">
                         <div>(aitbc-cli.sh) → (client.py) → (port 8000) → (RPC:8006) → (port 8010) → (port 11434)</div>
+                        <div style="font-size: 0.75rem; color: #94a3b8; margin-top: 0.25rem;">
+                            Note: Legacy ports 18000/18001 have been replaced with 8000/8010
+                        </div>
                     </div>
                 </div>