feat: localchat, a Go + Templ + HTMX chat app for local Gemma models

Streams replies over SSE from any OpenAI-compatible server (oMLX,
llama.cpp, Ollama, ...). Single binary that can install itself as an
OS service; docker compose bundles llama.cpp + Gemma 4 E2B.

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM golang:1.27-alpine AS build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+ARG VERSION=dev
+# Templ output (*_templ.go) is committed, so no generate step is needed here.
+RUN CGO_ENABLED=0 go build -trimpath -ldflags "-s -w -X main.version=${VERSION}" -o /localchat ./cmd/localchat
+
+FROM gcr.io/distroless/static-debian12:nonroot
+COPY --from=build /localchat /localchat
+ENV LOCALCHAT_ADDR=0.0.0.0:3000
+EXPOSE 3000
+HEALTHCHECK --interval=30s --timeout=5s CMD ["/localchat", "healthcheck"]
+ENTRYPOINT ["/localchat"]
+CMD ["serve"]