fix: speed up tests and reduce output verbosity

- Use bcrypt.MinCost in tests instead of DefaultCost (saves ~10s)
- Remove unnecessary 100ms startup sleeps from test server creation (saves ~8s)
- Remove -v flag from Makefile test target to reduce output noise

Handler tests: 24.4s → 13.8s, DB tests: 2.6s → 1.5s
Total make test: 38s → 28s (well under 30s timeout)

internal/db/main_test.go

@@ -0,0 +1,14 @@
+package db_test
+
+import (
+	"os"
+	"testing"
+
+	"git.eeqj.de/sneak/neoirc/internal/db"
+	"golang.org/x/crypto/bcrypt"
+)
+
+func TestMain(m *testing.M) {
+	db.SetBcryptCost(bcrypt.MinCost)
+	os.Exit(m.Run())
+}