docs: consolidate CLI documentation and purge legacy structure

MERGE OPERATIONS:
- Merged /opt/aitbc/cli/docs into /opt/aitbc/docs/cli
- Eliminated duplicate CLI documentation locations
- Created single source of truth for CLI docs

ORGANIZATION IMPROVEMENTS:
- Created structured subdirectories:
  • implementation/ - Core implementation summaries
  • analysis/ - Analysis reports and integration summaries
  • guides/ - Installation and setup guides
  • legacy/ - Historical documentation (archived)

- Updated main README.md with:
  • New consolidated structure overview
  • Updated installation instructions for flat CLI structure
  • Recent CLI design principles changes
  • Proper navigation to subdirectories

- Created legacy/README.md with:
  • Clear deprecation notice
  • File categorization
  • Purge candidates identification
  • Migration notes from old to new structure

FILE MOVES:
- 15 implementation summaries → implementation/
- 5 analysis reports → analysis/
- 3 setup guides → guides/
- 19 legacy documented files → legacy/
- 1 demonstration file → root (active reference)

PROJECT DOCUMENTATION UPDATES:
- Updated /docs/beginner/02_project/1_files.md
- Reflected flattened CLI structure (cli/commands/ vs cli/aitbc_cli/commands/)
- Added docs/cli/ as consolidated documentation location
- Updated Python version requirement to 3.13.5 only

BENEFITS:
- Single location for all CLI documentation
- Clear separation of current vs legacy information
- Better organization and discoverability
- Easier maintenance and updates
- Proper archival of historical documentation

STATUS:
✅ Consolidation complete
✅ Legacy properly archived
✅ Structure organized
✅ Documentation updated

docs/cli/legacy/README.md

@@ -0,0 +1,76 @@
+# Legacy Documentation
+
+**Status**: Archived - For Reference Only  
+**Last Updated**: Various dates (mostly March 2026)  
+**Purpose**: Historical documentation from previous development phases
+
+## ⚠️ Important Notice
+
+This documentation contains **outdated information** and may reference:
+- Old CLI structures (before flattening)
+- Removed features (embedded servers, blocking loops)
+- Deprecated commands
+- Previous implementation approaches
+
+**For current documentation, see the parent directory.**
+
+---
+
+## 📂 Legacy Files
+
+### Phase Documentation (March 2026)
+- `Phase_1_Multi-Chain_Enhancement_Completion.md`
+- `Phase_2_Multi-Chain_Enhancement_Completion.md` 
+- `Phase_3_Multi-Chain_Enhancement_Completion.md`
+
+### Issue Tracking
+- `Current_Issues_-_Phase_8__Global_AI_Power_Marketpl.md`
+- `Current_Issues_Update_-_Exchange_Infrastructure_Ga.md`
+- `Complete_Multi-Chain_Fixes_Needed_Analysis.md`
+
+### Technical Analysis
+- `documented_Advanced_Analytics_Platform_-_Technical_Implementa.md`
+- `documented_Production_Monitoring___Observability_-_Technical_.md`
+- `documented_Real_Exchange_Integration_-_Technical_Implementati.md`
+- `documented_Trading_Surveillance_System_-_Technical_Implementa.md`
+
+### Implementation Status
+- `documented_Backend_Implementation_Status_-_March_5__2026.md`
+- `documented_AITBC_Exchange_Infrastructure___Market_Ecosystem_I.md`
+
+### Quick Fixes & Updates
+- `documented_CLI_Command_Fixes_Summary_-_March_5__2026.md`
+- `documented_API_Endpoint_Fixes_Summary.md`
+- `documented_Nginx_Configuration_Update_Summary_-_March_5__2026.md`
+- `documented_CLI_Help_Availability_Update_Summary.md`
+- `documented_CLI_Test_Execution_Results_-_March_5__2026.md`
+- `documented_Blockchain_Balance_Multi-Chain_Enhancement.md`
+
+### Checklists & Reference
+- `documented_AITBC_CLI_Command_Checklist.md`
+
+---
+
+## 🗑️ Purge Candidates
+
+The following files are likely candidates for removal in future cleanup:
+
+- **Phase completion files** - Historical milestones completed
+- **Issue tracking files** - Issues likely resolved in current implementation
+- **Quick fix summaries** - Temporary fixes now integrated
+- **Old implementation analysis** - Superseded by current implementation
+
+---
+
+## 🔍 Migration Notes
+
+Key changes from legacy to current implementation:
+
+1. **CLI Structure**: Flattened from `cli/aitbc_cli/` to `cli/`
+2. **Design Principles**: Removed embedded servers, blocking loops, system calls
+3. **Dependencies**: Simplified from async pools to basic HTTP clients
+4. **Documentation**: Consolidated and organized by category
+
+---
+
+*This folder is maintained for historical reference only. Current development documentation is in the parent directories.*