Initial standalone dectalk TTS server extracted from the ttstoy bot cog

Self-contained HTTP service with engine, data, start script, systemd unit,
and documentation. Runs independently of the Discord bot on its fixed port.

test_api.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Test script for DECTalk server API
+
+BASE_URL="${1:-http://127.0.0.1:3000}"
+
+echo "🧪 Testing DECTalk Server at $BASE_URL"
+echo ""
+
+# Test 1: Health check
+echo "1️⃣ Testing /health endpoint..."
+curl -s "$BASE_URL/health" | jq '.' || echo "❌ Health check failed"
+echo ""
+
+# Test 2: Engine info
+echo "2️⃣ Testing /engine endpoint..."
+curl -s "$BASE_URL/engine" | jq '.' || echo "❌ Engine info failed"
+echo ""
+
+# Test 3: Simple GET endpoint
+echo "3️⃣ Testing /say endpoint (saving to test_say.mp3)..."
+curl -s "$BASE_URL/say?text=Hello%20world" -o test_say.mp3
+if [ -f test_say.mp3 ] && [ -s test_say.mp3 ]; then
+    echo "✅ Audio saved to test_say.mp3 ($(stat -f%z test_say.mp3 2>/dev/null || stat -c%s test_say.mp3) bytes)"
+else
+    echo "❌ Failed to generate audio"
+fi
+echo ""
+
+# Test 4: MiniMax-compatible endpoint
+echo "4️⃣ Testing /v1/t2a_v2 endpoint (MiniMax-compatible)..."
+curl -s -X POST "$BASE_URL/v1/t2a_v2" \
+    -H "Content-Type: application/json" \
+    -d '{
+        "text": "Testing MiniMax compatibility",
+        "voice_setting": {
+            "voice_id": "default",
+            "speed": 1.0
+        }
+    }' | jq '.base_resp, .data.audio_id' || echo "❌ MiniMax endpoint failed"
+echo ""
+
+echo "✅ All tests complete!"
+echo ""
+echo "To test audio playback:"
+echo "  ffplay test_say.mp3"
+echo "  # or"
+echo "  mpv test_say.mp3"