refactor: flatten CLI directory structure - remove 'box in a box'

BEFORE:
/opt/aitbc/cli/
├── aitbc_cli/                    # Python package (box in a box)
│   ├── commands/
│   ├── main.py
│   └── ...
├── setup.py

AFTER:
/opt/aitbc/cli/                    # Flat structure
├── commands/                      # Direct access
├── main.py                        # Direct access
├── auth/
├── config/
├── core/
├── models/
├── utils/
├── plugins.py
└── setup.py

CHANGES MADE:
- Moved all files from aitbc_cli/ to cli/ root
- Fixed all relative imports (from . to absolute imports)
- Updated setup.py entry point: aitbc_cli.main → main
- Added CLI directory to Python path in entry script
- Simplified deployment.py to remove dependency on deleted core.deployment
- Fixed import paths in all command files
- Recreated virtual environment with new structure

BENEFITS:
- Eliminated 'box in a box' nesting
- Simpler directory structure
- Direct access to all modules
- Cleaner imports
- Easier maintenance and development
- CLI works with both 'python main.py' and 'aitbc' commands

cli/commands/sync.py

@@ -0,0 +1,58 @@
+"""Sync management commands for AITBC."""
+
+import asyncio
+import sys
+from pathlib import Path
+
+import click
+
+from utils import success, error, run_subprocess
+
+
+@click.group()
+def sync():
+    """Blockchain synchronization utilities."""
+    pass
+
+
+@sync.command()
+@click.option('--source', default='http://10.1.223.40:8006', help='Source RPC URL (leader)')
+@click.option('--import-url', default='http://127.0.0.1:8006', help='Local RPC URL for import')
+@click.option('--batch-size', type=int, default=100, help='Blocks per batch')
+@click.option('--poll-interval', type=float, default=0.2, help='Seconds between batches')
+def bulk(source, import_url, batch_size, poll_interval):
+    """Bulk import blocks from a leader to catch up quickly."""
+    try:
+        # Resolve paths
+        blockchain_dir = Path(__file__).resolve().parents[3] / 'apps' / 'blockchain-node'
+        src_dir = blockchain_dir / 'src'
+        venv_python = blockchain_dir / '.venv' / 'bin' / 'python3'
+        sync_cli = src_dir / 'aitbc_chain' / 'sync_cli.py'
+
+        if not sync_cli.exists():
+            error("sync_cli.py not found. Ensure bulk sync feature is deployed.")
+            raise click.Abort()
+
+        cmd = [
+            str(venv_python),
+            str(sync_cli),
+            '--source', source,
+            '--import-url', import_url,
+            '--batch-size', str(batch_size),
+            '--poll-interval', str(poll_interval),
+        ]
+
+        # Prepare environment
+        env = {
+            'PYTHONPATH': str(src_dir),
+        }
+
+        success(f"Running bulk sync from {source} to {import_url} (batch size: {batch_size})")
+        result = run_subprocess(cmd, env=env, capture_output=False)
+        if result.returncode != 0:
+            error("Bulk sync failed. Check logs for details.")
+            raise click.Abort()
+        success("Bulk sync completed.")
+    except Exception as e:
+        error(f"Error during bulk sync: {e}")
+        raise click.Abort()