feat: bootstrap temporserv project scaffold

Add the initial project blueprint, Go backend skeleton, frontend app shell, database schema draft, and local development/deployment files.

deploy/Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.25-alpine AS backend-build
+WORKDIR /src
+COPY go.mod ./
+COPY cmd ./cmd
+COPY internal ./internal
+RUN go build -o /out/temporserv ./cmd/server
+
+FROM node:24-alpine AS web-build
+WORKDIR /src
+COPY apps/web/package*.json ./apps/web/
+RUN cd apps/web && npm install
+COPY apps/web ./apps/web
+RUN cd apps/web && npm run build
+
+FROM alpine:3.21
+WORKDIR /app
+RUN adduser -D appuser
+COPY --from=backend-build /out/temporserv /app/temporserv
+COPY --from=web-build /src/apps/web/dist /app/web
+RUN mkdir -p /app/data /music && chown -R appuser:appuser /app /music
+USER appuser
+EXPOSE 4040
+CMD ["/app/temporserv"]