Refactor to Vue 3 + FastAPI + SQLite architecture

- Backend: FastAPI + SQLite (WAL mode), 22 tables, ~40 API endpoints
- Frontend: Vue 3 + Vite + Pinia + Vue Router, 8 views, 3 stores
- Database: migrate from JSON file to SQLite with proper schema
- Dockerfile: multi-stage build (node + python)
- Deploy: K8s manifests (namespace, deployment, service, ingress, pvc, backup)
- CI/CD: Gitea Actions (test, deploy, PR preview at pr-$id.planner.oci.euphon.net)
- Tests: 20 Cypress E2E test files, 196 test cases, ~85% coverage
- Doc: test-coverage.md with full feature coverage report

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

deploy/backup-cronjob.yaml

@@ -0,0 +1,50 @@
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: planner-backup-minio
+  namespace: planner
+spec:
+  schedule: "0 */6 * * *"
+  successfulJobsHistoryLimit: 3
+  failedJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          containers:
+          - name: backup
+            image: python:3.12-alpine
+            command:
+            - /bin/sh
+            - -c
+            - |
+              apk add --no-cache curl sqlite >/dev/null 2>&1
+              curl -sL https://dl.min.io/client/mc/release/linux-arm64/mc -o /usr/local/bin/mc
+              chmod +x /usr/local/bin/mc
+              mc alias set s3 http://minio.minio.svc:9000 admin HpYMIVH0WN79VkzF4L4z8Zx1
+              TS=$(date +%Y%m%d_%H%M%S)
+              # SQLite safe backup
+              sqlite3 /data/planner.db ".backup /tmp/planner_${TS}.db"
+              mc cp "/tmp/planner_${TS}.db" "s3/planner-backups/planner_${TS}.db"
+              # Keep only last 60 backups
+              mc ls s3/planner-backups/ --json | python3 -c "
+              import sys, json
+              files = []
+              for line in sys.stdin:
+                  d = json.loads(line)
+                  if d.get('key','').startswith('planner_'):
+                      files.append(d['key'])
+              files.sort()
+              for f in files[:-60]:
+                  print(f)
+              " | while read f; do mc rm "s3/planner-backups/$f"; done
+              echo "Backup done: ${TS}"
+            volumeMounts:
+            - name: data
+              mountPath: /data
+              readOnly: true
+          volumes:
+          - name: data
+            persistentVolumeClaim:
+              claimName: planner-data
+          restartPolicy: OnFailure