unify k8s naming: drop be/fe split, single switchboard deployment

- k8s/backend.yaml → k8s/switchboard.yaml (already renamed)
- Deployment/Service name: switchboard-be → switchboard
- Removed component:backend labels (single image, no component split)
- Ingress: all paths route to switchboard service on :8080
- CI: updated manifest render, apply, and rollout references
- Removed stale extractor sidecar and extraction env vars
- Updated CHANGELOG and ROADMAP with CI fixes and design decisions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

k8s/switchboard.yaml

@@ -1,6 +1,6 @@
-# k8s/backend.yaml
+# k8s/switchboard.yaml
 # ============================================
-# Switchboard Core - Backend Deployment
+# Switchboard Core - Deployment
 # ============================================
 # Secrets:
 #   switchboard-db-credentials  - POSTGRES_USER, POSTGRES_PASSWORD
@@ -16,8 +16,6 @@
 #   STORAGE_CLASS               - StorageClass for PVC (e.g. "cephfs")
 #   STORAGE_SIZE                - PVC size (e.g. "10Gi" for PVC, "1Gi" for S3)
 #   STORAGE_BACKEND             - "pvc" or "s3" (default: "pvc")
-#   EXTRACTION_CONCURRENCY      - Max concurrent extractions (default "3")
-#   EXTRACTOR_IMAGE             - Sidecar image (LibreOffice headless)
 #
 # S3 secrets (Gitea Secrets — only when STORAGE_BACKEND=s3):
 #   S3_ENDPOINT                 - e.g. "http://minio:9000" or Ceph RGW URL
@@ -32,28 +30,25 @@
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: switchboard-be${DEPLOY_SUFFIX}
+  name: switchboard${DEPLOY_SUFFIX}
   namespace: ${NAMESPACE}
   labels:
     app: switchboard
-    component: backend
     env: ${ENVIRONMENT}
 spec:
-  replicas: ${BE_REPLICAS}
+  replicas: ${REPLICAS}
   selector:
     matchLabels:
       app: switchboard
-      component: backend
       env: ${ENVIRONMENT}
   template:
     metadata:
       labels:
         app: switchboard
-        component: backend
         env: ${ENVIRONMENT}
     spec:
       containers:
-      - name: backend
+      - name: switchboard
         image: ${IMAGE}:${IMAGE_TAG}
         imagePullPolicy: Always
         ports:
@@ -121,10 +116,6 @@ spec:
           value: "${STORAGE_BACKEND}"
         - name: STORAGE_PATH
           value: "/data/storage"
-        - name: EXTRACTION_MODE
-          value: "sidecar"
-        - name: EXTRACTION_CONCURRENCY
-          value: "${EXTRACTION_CONCURRENCY}"
         # S3 storage (optional — only used when STORAGE_BACKEND=s3)
         - name: S3_ENDPOINT
           valueFrom:
@@ -191,29 +182,6 @@ spec:
           timeoutSeconds: 5
           failureThreshold: 3
 
-      # Extractor sidecar (v0.12.0 Phase 2):
-      # Uncomment when switchboard-extractor image is built.
-      # See DESIGN-0.12.0.md — Phase 2: Extraction Pipeline.
-      #
-      # - name: extractor
-      #   image: ${EXTRACTOR_IMAGE}:${IMAGE_TAG}
-      #   imagePullPolicy: Always
-      #   env:
-      #   - name: STORAGE_PATH
-      #     value: "/data/storage"
-      #   - name: EXTRACTION_CONCURRENCY
-      #     value: "${EXTRACTION_CONCURRENCY}"
-      #   volumeMounts:
-      #   - name: storage
-      #     mountPath: /data/storage
-      #   resources:
-      #     requests:
-      #       memory: "256Mi"
-      #       cpu: "100m"
-      #     limits:
-      #       memory: "1Gi"
-      #       cpu: "1000m"
-
       volumes:
       - name: storage
         persistentVolumeClaim:
@@ -222,16 +190,14 @@ spec:
 apiVersion: v1
 kind: Service
 metadata:
-  name: switchboard-be${DEPLOY_SUFFIX}
+  name: switchboard${DEPLOY_SUFFIX}
   namespace: ${NAMESPACE}
   labels:
     app: switchboard
-    component: backend
     env: ${ENVIRONMENT}
 spec:
   selector:
     app: switchboard
-    component: backend
     env: ${ENVIRONMENT}
   ports:
   - protocol: TCP