Add local authentication option (#37)

Co-authored-by: Shaun Campbell <shaun@campbellwireless.net>
Reviewed-on: #37
Co-authored-by: AI Agent <ai-agent@campbellwireless.net>
Co-committed-by: AI Agent <ai-agent@campbellwireless.net>

src/lib/server/db/migrations.ts

@@ -65,6 +65,15 @@ export function runMigrations(db: Database): void {
 		)
 	`);
 
+	db.run(`
+		CREATE TABLE IF NOT EXISTS local_credentials (
+			user_id       TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+			password_hash TEXT NOT NULL,
+			created_at    TEXT NOT NULL DEFAULT (datetime('now')),
+			updated_at    TEXT NOT NULL DEFAULT (datetime('now'))
+		)
+	`);
+
 	db.run(`
 		CREATE TABLE IF NOT EXISTS cities (
 			id           INTEGER PRIMARY KEY,