Initial commit of Descrybe v2 without local scratch artifacts.

Drop one-shot tmp/axe scripts and agent i18n scratch so the Gitea tree is deployable.

apps/api/internal/billing/cost_test.go

@@ -0,0 +1,47 @@
+package billing
+
+import "testing"
+
+func TestTokenPackMath(t *testing.T) {
+	// Mirrors DebitAmount pack math: ceil(tokens/1000).
+	cases := []struct {
+		tokens int
+		packs  int
+	}{
+		{0, 0},
+		{1, 1},
+		{1000, 1},
+		{1001, 2},
+		{2500, 3},
+	}
+	for _, c := range cases {
+		packs := 0
+		if c.tokens > 0 {
+			packs = (c.tokens + 999) / 1000
+		}
+		got := DebitAmount(1, 1, c.tokens)
+		want := 1 + packs
+		if got != want {
+			t.Fatalf("tokens=%d DebitAmount=%d want %d (packs=%d)", c.tokens, got, want, packs)
+		}
+	}
+}
+
+func TestEstimateDebitMath(t *testing.T) {
+	// Pure pack math aligned with EstimateDebit / ConsumeCredits (costs=1).
+	cases := []struct {
+		featureTokens int
+		want          int
+	}{
+		{0, 1}, // base feature cost only
+		{1, 2},
+		{1000, 2},
+		{1001, 3},
+	}
+	for _, c := range cases {
+		got := DebitAmount(1, 1, c.featureTokens)
+		if got != c.want {
+			t.Fatalf("tokens=%d debit=%d want %d", c.featureTokens, got, c.want)
+		}
+	}
+}