fix: reset command now clears project configuration

The reset command was only removing the SQLite database but leaving
project configuration intact in ~/.basic-memory/config.json. This
caused projects to be recreated on next startup.

Now the reset command:
- Removes the SQLite database (existing behavior)  
- Resets project configuration to default state
- Recreates empty database (existing behavior)

Fixes #151

Co-authored-by: Paul Hernandez <phernandez@users.noreply.github.com>

Author: claude[bot]

src/basic_memory/cli/commands/db.py

@@ -1,13 +1,14 @@
 """Database management commands."""
 
 import asyncio
+from pathlib import Path
 
 import typer
 from loguru import logger
 
 from basic_memory import db
 from basic_memory.cli.app import app
-from basic_memory.config import app_config
+from basic_memory.config import app_config, config_manager
 
 
 @app.command()
@@ -25,6 +26,12 @@ def reset(
             db_path.unlink()
             logger.info(f"Database file deleted: {db_path}")
 
+        # Reset project configuration
+        config_manager.config.projects = {"main": str(Path.home() / "basic-memory")}
+        config_manager.config.default_project = "main"
+        config_manager.save_config(config_manager.config)
+        logger.info("Project configuration reset to default")
+
         # Create a new empty database
         asyncio.run(db.run_migrations(app_config))
         logger.info("Database reset complete")