docs: add deployment playbooks and templates

template/gitops/nextjs-with-migrate-job/backend/Dockerfile

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+FROM oven/bun:1.3.14-alpine AS builder
+WORKDIR /app
+COPY . .
+RUN bun install --frozen-lockfile
+RUN bun build --compile --outfile #APP_NAME-backend src/index.ts
+
+FROM alpine:3.22
+WORKDIR /app
+RUN apk add --no-cache libstdc++ libgcc
+COPY --from=builder /app/#APP_NAME-backend ./#APP_NAME-backend
+CMD ["./#APP_NAME-backend"]

template/gitops/nextjs-with-migrate-job/backend/README.md

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+# Backend Variant
+
+Use this variant when the repo contains a separate background service or API alongside the main Next.js app.
+
+Typical examples:
+
+1. job worker
+2. queue consumer
+3. bot bridge
+4. internal Bun API
+
+Share the same secret only when both components truly need the same runtime configuration.

template/gitops/nextjs-with-migrate-job/backend/deployment-backend.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: #APP_NAME-backend
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: #APP_NAME-backend
+  template:
+    metadata:
+      labels:
+        app: #APP_NAME-backend
+    spec:
+      containers:
+        - name: #APP_NAME-backend
+          image: #IMAGE:backend
+          imagePullPolicy: Always
+          envFrom:
+            - secretRef:
+                name: #SECRET_NAME