Seed N-001-1234-Johnson with 41 construction tasks across
all phases (preconstruction through closeout), 19 FS
dependencies, and 4 milestones. Remove legacy demo project.
Fix project list to order by name for consistent first load.
Extend schema with customers and vendors tables, add project
fields (status, address, client_name, project_manager), and
seed with 40 customers, 25 vendors, and 10 projects from
client CSV data.
