feat: migrate to typed messages, drop base64

- Decode TTSRequest via natsutil.Decode[messages.TTSRequest]
- Stream audio as raw bytes via messages.TTSAudioChunk (no base64)
- Non-stream response uses messages.TTSFullResponse
- Status updates use messages.TTSStatus
- Voice list/refresh use messages.TTSVoiceListResponse/TTSVoiceRefreshResponse
- Registry returns []messages.TTSVoiceInfo (not []map[string]any)
- Remove strVal/boolVal helpers
- Add .dockerignore, GOAMD64=v3 in Dockerfile
- Update tests for typed structs (13 tests pass)

main_test.go

@@ -8,6 +8,10 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"git.daviestechlabs.io/daviestechlabs/handler-base/messages"
+	"git.daviestechlabs.io/daviestechlabs/handler-base/natsutil"
+	"github.com/vmihailenco/msgpack/v5"
 )
 
 func TestVoiceRegistryRefresh(t *testing.T) {
@@ -100,20 +104,58 @@ func TestSynthesizeHTTP(t *testing.T) {
 	}
 }
 
-func TestHelperFunctions(t *testing.T) {
-	m := map[string]any{"text": "hello", "stream": true, "count": 42}
+func TestTTSRequestDecode(t *testing.T) {
+	req := messages.TTSRequest{
+		Text:     "hello world",
+		Speaker:  "custom-en",
+		Language: "en",
+		Stream:   true,
+	}
+	data, err := msgpack.Marshal(&req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	decoded, err := natsutil.Decode[messages.TTSRequest](data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Text != "hello world" {
+		t.Errorf("Text = %q", decoded.Text)
+	}
+	if decoded.Speaker != "custom-en" {
+		t.Errorf("Speaker = %q", decoded.Speaker)
+	}
+	if !decoded.Stream {
+		t.Error("Stream should be true")
+	}
+}
 
-	if got := strVal(m, "text", ""); got != "hello" {
-		t.Errorf("strVal(text) = %q", got)
+func TestTTSAudioChunkRoundtrip(t *testing.T) {
+	chunk := messages.TTSAudioChunk{
+		SessionID:   "sess-001",
+		ChunkIndex:  0,
+		TotalChunks: 2,
+		Audio:       make([]byte, 32768),
+		IsLast:      false,
+		Timestamp:   1234567890,
+		SampleRate:  24000,
 	}
-	if got := strVal(m, "missing", "def"); got != "def" {
-		t.Errorf("strVal(missing) = %q", got)
+	data, err := msgpack.Marshal(&chunk)
+	if err != nil {
+		t.Fatal(err)
 	}
-	if got := boolVal(m, "stream", false); !got {
-		t.Errorf("boolVal(stream) = %v", got)
+	var got messages.TTSAudioChunk
+	if err := msgpack.Unmarshal(data, &got); err != nil {
+		t.Fatal(err)
 	}
-	if got := boolVal(m, "missing", true); !got {
-		t.Errorf("boolVal(missing) = %v", got)
+	if got.SessionID != "sess-001" {
+		t.Errorf("SessionID = %q", got.SessionID)
+	}
+	if len(got.Audio) != 32768 {
+		t.Errorf("Audio len = %d", len(got.Audio))
+	}
+	if got.SampleRate != 24000 {
+		t.Errorf("SampleRate = %d", got.SampleRate)
 	}
 }