feat: organize documentation into logical subdirectories

✅ Created organized project documentation structure
- project/ai-economics/: AI Economics Masters documentation
- project/cli/: Command-line interface documentation
- project/infrastructure/: System infrastructure and deployment docs
- project/requirements/: Project requirements and migration docs
- project/completion/: 100% project completion summary
- project/workspace/: Workspace strategy and organization

✅ Updated MASTER_INDEX.md to reflect new organization
- Added project documentation section with detailed breakdown
- Updated navigation to include new subdirectory structure
- Maintained existing documentation hierarchy

✅ Updated project/README.md for new organization
- Complete project documentation overview
- Directory structure explanation
- Quick access guide for each subdirectory
- Links to related documentation

📊 Documentation Organization Results:
- 10 files moved into 6 logical subdirectories
- Improved navigation and discoverability
- Maintained all existing content and links
- Enhanced project documentation structure

🎯 Documentation Status: 100% Organized and Complete

docs/project/requirements/REQUIREMENTS_MERGE_SUMMARY.md

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+# Requirements Merge Summary
+# Generated: 2026-03-29
+# Source: All subdirectory requirements.txt files
+
+## Files Processed:
+- /opt/aitbc/cli/requirements.txt (12 packages)
+- /opt/aitbc/apps/coordinator-api/requirements.txt (15 packages)
+- /opt/aitbc/apps/wallet/requirements.txt (10 packages)
+- /opt/aitbc/apps/exchange/requirements.txt (5 packages)
+- /opt/aitbc/apps/blockchain-node/requirements.txt (10 packages)
+- /opt/aitbc/apps/blockchain-explorer/requirements.txt (5 packages)
+- /opt/aitbc/packages/py/aitbc-agent-sdk/requirements.txt (11 packages)
+
+## New Packages Added to Central Requirements:
+- aiohttp>=3.9.0
+- aiosqlite>=0.20.0
+- alembic>=1.12.0
+- alembic>=1.13.1
+- asyncpg>=0.29.0
+- click-completion>=0.5.2
+- click>=8.0.0
+- colorama>=0.4.4
+- cryptography>=3.4.8
+- cryptography>=41.0.0
+- fastapi>=0.104.0
+- fastapi>=0.111.0
+- gunicorn>=22.0.0
+- httpx>=0.24.0
+- httpx>=0.27.0
+- keyring>=23.0.0
+- prometheus-client>=0.19.0
+- psutil>=5.9.0
+- pydantic-settings>=2.2.1
+- pydantic>=1.10.0
+- pydantic>=2.0.0
+- pydantic>=2.4.0
+- pydantic>=2.7.0
+- python-dotenv>=0.19.0
+- python-dotenv>=1.0.1
+- python-multipart>=0.0.6
+- pyyaml>=6.0
+- redis>=5.0.0
+- requests>=2.31.0
+- rich>=14.3.3
+- slowapi>=0.1.8
+- sqlalchemy>=2.0.30
+- sqlalchemy[asyncio]>=2.0.47
+- sqlmodel>=0.0.16
+- tabulate>=0.9.0
+- tenseal
+- uvicorn>=0.24.0
+- uvicorn[standard]>=0.30.0
+- web3>=6.11.0
+- websockets>=12.0
+
+## Result:
+- Total unique packages: 44
+- Central venv packages: 129 (including dependencies)
+- All services confirmed working after merge

docs/project/requirements/REQUIREMENTS_MIGRATION_REPORT.md

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+# AITBC Requirements Migration Report
+
+## Summary
+- Files analyzed: 1
+- Files migrated: 0
+- Files kept: 1
+- Errors: 0
+
+## ⚠️ Files Kept (Specialized Dependencies)
+### `/opt/aitbc/apps/coordinator-api/src/app/services/multi_language/requirements.txt`
+- Coverage: 51.4%
+- Uncovered packages: 16
+  - **Translation Nlp**: 8 packages
+    - `openai>=1.3.0`
+    - `google-cloud-translate>=3.11.0`
+    - `deepl>=1.16.0`
+    - ... and 5 more
+  - **Testing**: 1 packages
+    - `pytest-mock>=3.12.0`
+  - **Security**: 2 packages
+    - `python-jose[cryptography]>=3.3.0`
+    - `passlib[bcrypt]>=1.7.4`
+  - **Other**: 5 packages
+    - `Multi-Language Service Requirements`
+    - `Dependencies and requirements for multi-language support`
+    - `aioredis>=2.0.1`
+    - ... and 2 more