Extract DB utility functions (buildDbUrl, getDbPaths, ensureDataDirectory,
runAlterMigrations, etc.) from client.ts into db-utils.ts.
client.ts contained top-level initialization code (ensureDataDirectory,
createClient) that ran on every import. database.test.ts imported utility
functions from client.ts, which triggered the initialization as a side
effect — creating backend/data/ with a .write-test file and
medassist-ng.db every time tests ran.
Now database.test.ts imports from db-utils.ts (side-effect-free), and
client.ts re-exports everything for backward compatibility.
Daniel Volz
6b3a7b4104