feat(deploy): add containerized deployment configuration and scripts

- Add Dockerfile for frontend and server services
- Add Docker Compose configs (standard and offline mode)
- Add nginx.conf for admin-web service
- Add deploy scripts: package.sh (packaging) and load-and-start.sh (startup)
- Add deploy/config.yaml, .env.example, and prompts.yml configurations
- Add image management design specification doc

server/Dockerfile

@@ -0,0 +1,41 @@
+# syntax=docker/dockerfile:1
+
+# ─── Stage 1: Build Go binaries ───────────────────────────────────────────────
+FROM golang:1.22-alpine AS builder
+
+ARG SERVICE=tenant-api
+
+RUN apk --no-cache add ca-certificates git
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+    go build -trimpath -ldflags="-s -w" \
+    -o /bin/service ./cmd/${SERVICE}
+
+# ─── Stage 2: Migration image (bundles SQL files + migrate binary) ─────────────
+FROM migrate/migrate:v4.18.1 AS migrate-tool
+
+FROM alpine:3.19 AS migrate
+RUN apk --no-cache add ca-certificates
+COPY --from=migrate-tool /usr/local/bin/migrate /usr/local/bin/migrate
+COPY migrations/ /migrations/
+COPY migrations_monitoring/ /migrations_monitoring/
+ENTRYPOINT ["/usr/local/bin/migrate"]
+
+# ─── Stage 3: Runtime image ────────────────────────────────────────────────────
+FROM alpine:3.19 AS runtime
+RUN apk --no-cache add ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=builder /bin/service /app/service
+COPY configs/ /app/configs/
+
+EXPOSE 8080
+ENTRYPOINT ["/app/service"]