feat(#399): add Docker Compose dev overlay for speech services

Add docker-compose.speech.yml with three speech services:
- Speaches (STT via Whisper + basic TTS) on port 8090
- Kokoro-FastAPI (default TTS) on port 8880
- Chatterbox TTS (premium, GPU-required) on port 8881 behind
  the premium-tts profile

All services include health checks, connect to the mosaic-internal
network, and follow existing naming/labeling conventions. Makefile
targets added: speech-up, speech-down, speech-logs.

Fixes #399

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help install dev build test docker-up docker-down docker-logs docker-ps docker-build docker-restart docker-test clean
+.PHONY: help install dev build test docker-up docker-down docker-logs docker-ps docker-build docker-restart docker-test speech-up speech-down speech-logs clean
 
 # Default target
 help:
@@ -24,6 +24,11 @@ help:
 	@echo "  make docker-test            Run Docker smoke test"
 	@echo "  make docker-test-traefik    Run Traefik integration tests"
 	@echo ""
+	@echo "Speech Services:"
+	@echo "  make speech-up              Start speech services (STT + TTS)"
+	@echo "  make speech-down            Stop speech services"
+	@echo "  make speech-logs            View speech service logs"
+	@echo ""
 	@echo "Database:"
 	@echo "  make db-migrate       Run database migrations"
 	@echo "  make db-seed          Seed development data"
@@ -85,6 +90,16 @@ docker-test:
 docker-test-traefik:
 	./tests/integration/docker/traefik.test.sh all
 
+# Speech services
+speech-up:
+	docker compose -f docker-compose.yml -f docker-compose.speech.yml up -d speaches kokoro-tts
+
+speech-down:
+	docker compose -f docker-compose.yml -f docker-compose.speech.yml down --remove-orphans
+
+speech-logs:
+	docker compose -f docker-compose.yml -f docker-compose.speech.yml logs -f speaches kokoro-tts
+
 # Database operations
 db-migrate:
 	cd apps/api && pnpm prisma:migrate