feat: migrate to typed messages, drop base64

- Switch OnMessage → OnTypedMessage with natsutil.Decode[messages.VoiceRequest]
- Return *messages.VoiceResponse with raw []byte audio (no base64)
- Use messages.DocumentSource for RAG sources
- Remove strVal/boolVal helpers
- Add .dockerignore, GOAMD64=v3 in Dockerfile
- Update tests for typed structs (7 tests pass)

main_test.go

@@ -2,25 +2,59 @@ package main
 
 import (
 	"testing"
+
+	"git.daviestechlabs.io/daviestechlabs/handler-base/messages"
+	"git.daviestechlabs.io/daviestechlabs/handler-base/natsutil"
+	"github.com/vmihailenco/msgpack/v5"
 )
 
-func TestStrVal(t *testing.T) {
-	m := map[string]any{"key": "value"}
-	if got := strVal(m, "key", ""); got != "value" {
-		t.Errorf("strVal(key) = %q", got)
+func TestVoiceRequestDecode(t *testing.T) {
+	req := messages.VoiceRequest{
+		RequestID:  "req-123",
+		Audio:      []byte{0x01, 0x02, 0x03},
+		Language:   "en",
+		Collection: "docs",
 	}
-	if got := strVal(m, "missing", "def"); got != "def" {
-		t.Errorf("strVal(missing) = %q", got)
+	data, err := msgpack.Marshal(&req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	decoded, err := natsutil.Decode[messages.VoiceRequest](data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if decoded.RequestID != "req-123" {
+		t.Errorf("RequestID = %q", decoded.RequestID)
+	}
+	if len(decoded.Audio) != 3 {
+		t.Errorf("Audio len = %d", len(decoded.Audio))
 	}
 }
 
-func TestBoolVal(t *testing.T) {
-	m := map[string]any{"flag": true}
-	if got := boolVal(m, "flag", false); !got {
-		t.Error("expected true")
+func TestVoiceResponseRoundtrip(t *testing.T) {
+	resp := messages.VoiceResponse{
+		RequestID:     "req-456",
+		Response:      "It is sunny today.",
+		Audio:         make([]byte, 8000),
+		Transcription: "What is the weather?",
+		Sources:       []messages.DocumentSource{{Text: "weather doc", Score: 0.9}},
 	}
-	if got := boolVal(m, "missing", false); got {
-		t.Error("expected false fallback")
+	data, err := msgpack.Marshal(&resp)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var got messages.VoiceResponse
+	if err := msgpack.Unmarshal(data, &got); err != nil {
+		t.Fatal(err)
+	}
+	if got.Response != "It is sunny today." {
+		t.Errorf("Response = %q", got.Response)
+	}
+	if len(got.Audio) != 8000 {
+		t.Errorf("Audio len = %d", len(got.Audio))
+	}
+	if len(got.Sources) != 1 || got.Sources[0].Text != "weather doc" {
+		t.Errorf("Sources = %v", got.Sources)
 	}
 }