initial commit: FastAPI translator proxying to Ollama on radagast

- app.py: /api/models filtered to gemma+aya, /api/translate streams
  NDJSON from Ollama with stream:true, /healthz for k8s probes
- static/index.html: dark-mode UI, three dropdowns (source/target/model),
  live token streaming with spinner+pulse+timer indicators
- Dockerfile: two-stage uv build, slim Python 3.13 runtime
- .gitea/workflows/build.yml: multi-arch (amd64+arm64) build, push to
  Scaleway registry on push to main
- build.sh: manual fallback if Gitea Actions isn't available

Dockerfile

@@ -0,0 +1,28 @@
+# syntax=docker/dockerfile:1.7
+
+# Build stage: install deps into a venv with uv.
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim AS builder
+
+ENV UV_LINK_MODE=copy \
+    UV_COMPILE_BYTECODE=1 \
+    UV_PROJECT_ENVIRONMENT=/app/.venv
+
+WORKDIR /app
+COPY pyproject.toml uv.lock ./
+RUN uv sync --frozen --no-dev --no-install-project
+
+# Runtime stage: slim Python, just the venv + app code.
+FROM python:3.13-slim-bookworm
+
+ENV PATH="/app/.venv/bin:$PATH" \
+    PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1
+
+WORKDIR /app
+COPY --from=builder /app/.venv /app/.venv
+COPY app.py ./
+COPY static ./static
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]