feat: CI pipeline, lint fixes, and Renovate config

- pyproject.toml with ruff/pytest config (setuptools<81 pin)
- Full test suite (26 tests)
- Gitea Actions CI (lint, test, docker, notify)
- Ruff lint/format fixes across source files
- Renovate config for automated dependency updates

Ref: ADR-0057

pyproject.toml

@@ -0,0 +1,58 @@
+[project]
+name = "stt-module"
+version = "1.0.0"
+description = "Streaming STT service - speech to text via NATS using Whisper with VAD and interrupt detection"
+readme = "README.md"
+requires-python = ">=3.11"
+license = { text = "MIT" }
+authors = [{ name = "Davies Tech Labs" }]
+
+dependencies = [
+    "nats-py>=2.0.0,<3.0.0",
+    "httpx>=0.20.0,<1.0.0",
+    "msgpack",
+    "numpy>=1.20.0,<2.0.0",
+    "webrtcvad>=2.0.10",
+    "setuptools<81",  # required by webrtcvad for pkg_resources
+    "opentelemetry-api",
+    "opentelemetry-sdk",
+    "opentelemetry-exporter-otlp-proto-grpc",
+    "opentelemetry-exporter-otlp-proto-http",
+    "opentelemetry-instrumentation-httpx",
+    "opentelemetry-instrumentation-logging",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0.0",
+    "pytest-asyncio>=0.23.0",
+    "ruff>=0.1.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["."]
+only-include = ["stt_streaming.py", "stt_streaming_local.py", "healthcheck.py"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "UP", "B", "C4", "SIM"]
+ignore = ["E501"]
+
+[tool.ruff.format]
+quote-style = "double"
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = "-v --tb=short"
+filterwarnings = ["ignore::DeprecationWarning"]