docs: fix incorrect dependency handling instructions after dev/env cleanup

Documentation Correction - Dependency Management:
✅ INCORRECT INSTRUCTIONS FIXED: Updated dependency handling after dev/env cleanup
- docs/advanced/05_development/DEVELOPMENT_GUIDELINES.md: Fixed npm install guidance
- Problem: Documentation referenced dev/env/node_modules/ which was removed
- Solution: Updated to reflect actual project structure

✅ CORRECTED DEPENDENCY HANDLING:
📦 npm install: Use in contracts/ directory for smart contracts development
🐍 Python: Use central /opt/aitbc/venv virtual environment
📁 Context: Instructions now match actual directory structure

✅ PREVIOUS INCORRECT INSTRUCTIONS:
❌ npm install  # Will go to dev/env/node_modules/ (directory removed)
❌ python -m venv dev/env/.venv (redundant, use central venv)

✅ UPDATED CORRECT INSTRUCTIONS:
✅ npm install  # Use in contracts/ directory for smart contracts development
✅ source /opt/aitbc/venv/bin/activate  # Use central Python virtual environment

✅ STRUCTURAL CONSISTENCY:
📁 contracts/: Contains package.json for smart contracts development
📁 /opt/aitbc/venv/: Central Python virtual environment
📁 dev/env/: Empty after cleanup (no longer used for dependencies)
📖 Documentation: Now accurately reflects project structure

RESULT: Successfully corrected dependency handling instructions to reflect the actual project structure after dev/env cleanup, ensuring developers use the correct locations for npm and Python dependencies.

docs/advanced/05_development/DEVELOPMENT_GUIDELINES.md

@@ -113,8 +113,8 @@ touch dev/tests/test_new_feature.py
 touch dev/scripts/fix_bug.py
 
 # Right way to handle dependencies
-npm install  # Will go to dev/env/node_modules/
-python -m venv dev/env/.venv
+npm install  # Use in contracts/ directory for smart contracts development
+source /opt/aitbc/venv/bin/activate  # Use central Python virtual environment
 ```
 
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