Update legal files and build configuration: Bookmann → Bookhoard

Root level changes:
- LICENSE: Update copyright notice to Bookhoard
- .gitignore: Update build artifact patterns
- package.json: Update package name to bookhoard
- TROUBLESHOOTING.md: Update all references and examples
- README.md: Update database connection examples

Part of project rename to Bookhoard.

README.md

@@ -139,7 +139,7 @@ The first user who registers automatically becomes an admin. For additional admi
 
 ```sql
 -- Connect to database
-docker exec -it bookmann_db psql -U postgres -d bookmann
+docker exec -it bookhoard_db psql -U postgres -d bookhoard
 
 -- Promote user to admin
 UPDATE users SET role = 'admin' WHERE email = 'user@example.com';