chore: remove legacy deployment files and update gitignore

- Removed .deployment_progress tracking file
- Removed .last_backup tracking file
- Removed AITBC1_TEST_COMMANDS.md and AITBC1_UPDATED_COMMANDS.md documentation
- Updated .gitignore for project reorganization (project-config/, docs/, security/, backup-config/)
- Enhanced .gitignore patterns for __pycache__, backups, and monitoring files
- Aligned gitignore with new directory structure from project reorganization

scripts/setup.sh

@@ -144,8 +144,8 @@ setup_venvs() {
     log "Installing all dependencies from central requirements.txt..."
     
     # Install main requirements (contains all service dependencies)
-    if [ -f "/opt/aitbc/project-config/requirements.txt" ]; then
-        pip install -r /opt/aitbc/project-config/requirements.txt
+    if [ -f "/opt/aitbc/requirements.txt" ]; then
+        pip install -r /opt/aitbc/requirements.txt
     else
         error "Main requirements.txt not found"
     fi