feat: integrate dynamic mode into Helm chart v2.0.0-dev

Implements unified Helm chart supporting both deployment modes:
- persistent: Traditional PVC-based deployment (v1.x behavior)
- dynamic: Serverless Knative with auto-scaling and dynamic routing

## Chart Changes
- Chart.yaml: Bump to v2.0.0-dev with deployment mode support
- values.yaml: Add deploymentMode field and dynamic configuration
- All templates: Conditional rendering based on deploymentMode

## Dynamic Mode Templates
- knative-service.yaml: Auto-scaling dev containers with repo routing
- routing-proxy.yaml: GitHub repo extraction service
- dynamic-ingress.yaml: Ingress with Authentik auth support

## Usage Examples
```bash
# Traditional persistent mode (default)
helm install mydev ./chart --set name=mydev --set githubRepo=...

# Dynamic serverless mode
helm install mydev ./chart -f values-dynamic.yaml \
  --set name=mydev --set dynamic.ingress.host=devcontainer.example.com

# Development builds
helm install mydev ./chart --set deploymentMode=dynamic \
  --set image.tag=2.0.0-dev --set dynamic.ingress.host=...
```

All existing persistent deployments remain compatible (deploymentMode defaults to "persistent").

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

chart/templates/routing-proxy.yaml

@@ -0,0 +1,66 @@
+{{- if and (eq .Values.deploymentMode "dynamic") .Values.dynamic.routingProxy.enabled }}
+---
+# Routing proxy deployment for dynamic GitHub repo extraction
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "devcontainer.fullname" . }}-routing-proxy
+  labels:
+    {{- include "devcontainer.labels" . | nindent 4 }}
+    app.kubernetes.io/component: routing-proxy
+spec:
+  replicas: {{ .Values.dynamic.routingProxy.replicas }}
+  selector:
+    matchLabels:
+      {{- include "devcontainer.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: routing-proxy
+  template:
+    metadata:
+      labels:
+        {{- include "devcontainer.labels" . | nindent 8 }}
+        app.kubernetes.io/component: routing-proxy
+    spec:
+      containers:
+      - name: routing-proxy
+        image: "{{ .Values.dynamic.routingProxy.image.repository }}:{{ .Values.dynamic.routingProxy.image.tag }}"
+        imagePullPolicy: {{ .Values.dynamic.routingProxy.image.pullPolicy }}
+        ports:
+        - containerPort: 8080
+          name: http
+        env:
+        - name: DEVCONTAINER_SERVICE_URL
+          value: "{{ include "devcontainer.fullname" . }}.{{ .Release.Namespace }}.svc.cluster.local"
+        resources:
+          {{- toYaml .Values.dynamic.routingProxy.resources | nindent 10 }}
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /health
+            port: 8080
+          initialDelaySeconds: 2
+          periodSeconds: 5
+
+---
+# Service for routing proxy
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "devcontainer.fullname" . }}-routing-proxy
+  labels:
+    {{- include "devcontainer.labels" . | nindent 4 }}
+    app.kubernetes.io/component: routing-proxy
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 8080
+    name: http
+  selector:
+    {{- include "devcontainer.selectorLabels" . | nindent 4 }}
+    app.kubernetes.io/component: routing-proxy
+{{- end }}