Initial scaffold: ESP32-P4 firmware + voice gateway for Tatlock endpoint

DeskLock gives the Tatlock butler a face and voice on a Waveshare
ESP32-P4-WIFI6-Touch-LCD-3.4C round display in the living room.

- firmware/: ESP-IDF project targeting esp32p4 with the Waveshare XC BSP
- gateway/: FastAPI voice bridge (faster-whisper STT, Tatlock chat, Piper TTS)
- docs/architecture.md: component design and device<->gateway WS protocol

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

gateway/pyproject.toml

@@ -0,0 +1,38 @@
+[project]
+name = "desklock-gateway"
+version = "0.1.0"
+description = "Voice gateway bridging the DeskLock device to the Tatlock butler (STT/chat/TTS)"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi>=0.115",
+    "uvicorn[standard]>=0.30",
+    "httpx>=0.27",
+    "pydantic-settings>=2.4",
+]
+
+[project.optional-dependencies]
+speech = [
+    "faster-whisper>=1.0",
+    "piper-tts>=1.2",
+]
+dev = [
+    "pytest>=8.0",
+    "pytest-asyncio>=0.24",
+    "ruff>=0.6",
+    "mypy>=1.11",
+]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.ruff]
+line-length = 100
+src = ["src"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]