chore: import upstream snapshot with attribution

deployment/k8s/optional-mongo/README.md

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+# Optional: MongoDB manifests
+
+These manifests are **opt-in**. The default DocsGPT install uses Postgres
+for user data (see `deployment/k8s/deployments/postgres-deploy.yaml`).
+
+Apply the manifests in this directory only if you run DocsGPT with the
+MongoDB-backed vector store (`VECTOR_STORE=mongodb`) and need an
+in-cluster MongoDB, or if you are intentionally running on the legacy
+MongoDB user-data store during the Postgres migration window.
+
+Mirrors `deployment/optional/` for compose — not applied by the default
+`kubectl apply -k deployment/k8s/`.
+
+## Usage
+
+```bash
+kubectl apply -f deployment/k8s/optional-mongo/deployments/mongo-deploy.yaml
+kubectl apply -f deployment/k8s/optional-mongo/services/mongo-service.yaml
+```
+
+Then extend `docsgpt-secrets.yaml` with a base64-encoded `MONGO_URI`
+pointing at `mongodb://mongodb-service:27017/docsgpt?retryWrites=true&w=majority`
+(or your Atlas/external URI) before re-applying the secret.

deployment/k8s/optional-mongo/deployments/mongo-deploy.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: mongodb-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi  # Adjust size as needed
+
+---
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mongodb
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mongodb
+  template:
+    metadata:
+      labels:
+        app: mongodb
+    spec:
+      containers:
+      - name: mongodb
+        image: mongo:latest
+        ports:
+        - containerPort: 27017
+        resources:
+          limits:
+            memory: "1Gi"
+            cpu: "0.5"
+          requests:
+            memory: "512Mi"
+            cpu: "250m"
+        volumeMounts:
+        - name: mongodb-data
+          mountPath: /data/db
+      volumes:
+      - name: mongodb-data
+        persistentVolumeClaim:
+          claimName: mongodb-pvc

deployment/k8s/optional-mongo/services/mongo-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: mongodb-service
+spec:
+  selector:
+    app: mongodb
+  ports:
+    - protocol: TCP
+      port: 27017
+      targetPort: 27017
+  type: ClusterIP