fix: add request_upgrades.py to image, add web dashboard

- Dockerfile: add COPY for request_upgrades.py (was missing — root cause
  of Monday upgrade CronJob failing with 'No such file'), add git (needed
  for repo cloning in upgrade workflow), copy web.py + templates/
- requirements.txt: add fastapi, uvicorn, jinja2 for web dashboard
- web.py: FastAPI dashboard with image inventory and upgrade trigger pages
- templates/: base layout, images page (namespace→app→container grouped
  with live version status), upgrade page (outdated list + trigger button
  + job history)
- kubernetes/web-deployment.yaml: Deployment + LoadBalancer at 192.168.87.13
- kubernetes/rbac.yaml: add version-tracker-web ServiceAccount, ClusterRole
  (read pods/deployments/replicasets/statefulsets/daemonsets/jobs/cronjobs),
  and namespace Role to create upgrade Jobs
- kubernetes/upgrade-cronjob.yaml: fix YAML indentation bug on GITEA_USERNAME
  and GITEA_COMMITTER_NAME env vars

kubernetes/web-deployment.yaml

@@ -0,0 +1,67 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: version-tracker-web
+  namespace: k8s-version-tracker
+  labels:
+    app: version-tracker-web
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: version-tracker-web
+  template:
+    metadata:
+      labels:
+        app: version-tracker-web
+    spec:
+      serviceAccountName: version-tracker-web
+      containers:
+        - name: web
+          image: registry.storedbox.net/k8s-version-tracker:latest
+          imagePullPolicy: Always
+          command: ["python", "web.py"]
+          ports:
+            - containerPort: 8080
+              name: http
+          env:
+            - name: MATTERMOST_WEBHOOK_URL
+              valueFrom:
+                secretKeyRef:
+                  name: version-tracker-secrets
+                  key: MATTERMOST_WEBHOOK_URL
+            - name: APPROVAL_MIDDLEWARE_URL
+              value: "http://192.168.87.14:8085"
+          resources:
+            requests:
+              cpu: 50m
+              memory: 128Mi
+            limits:
+              cpu: 500m
+              memory: 512Mi
+          readinessProbe:
+            httpGet:
+              path: /api/images
+              port: 8080
+            initialDelaySeconds: 5
+            periodSeconds: 10
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: version-tracker-web
+  namespace: k8s-version-tracker
+  labels:
+    app: version-tracker-web
+  annotations:
+    metallb.universe.tf/loadBalancerIPs: 192.168.87.13
+spec:
+  type: LoadBalancer
+  selector:
+    app: version-tracker-web
+  ports:
+    - name: http
+      port: 80
+      targetPort: 8080