Cover CLI client request patterns in api-compat

Add test cases for GET /api/packages/{name} and GET /api/packages
without explicit month parameters, matching how the pkgstats-cli
client interacts with the API.

Author: pierres

cmd/api-compat/main.go

@@ -100,6 +100,10 @@ var tests = []testCase{
 	// max valid offset (boundary)
 	jsonTest("/api/packages?limit=2&offset=100000&" + monthParams),
 
+	// --- CLI client specific patterns (no month params) ---
+	jsonTest("/api/packages/pacman"),
+	jsonTest("/api/packages?limit=10&query=pac"),
+
 	// --- error cases (expect matching HTTP status codes) ---
 
 	// invalid limit