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/dynamic-ingress.yaml

@@ -0,0 +1,68 @@
+{{- if and (eq .Values.deploymentMode "dynamic") .Values.dynamic.ingress.enabled .Values.dynamic.ingress.host }}
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ include "devcontainer.fullname" . }}-dynamic
+  labels:
+    {{- include "devcontainer.labels" . | nindent 4 }}
+    app.kubernetes.io/component: dynamic-ingress
+  annotations:
+    {{- if .Values.dynamic.ingress.className }}
+    kubernetes.io/ingress.class: {{ .Values.dynamic.ingress.className }}
+    {{- end }}
+
+    # SSL configuration
+    {{- if .Values.dynamic.ingress.tls.enabled }}
+    cert-manager.io/cluster-issuer: {{ .Values.dynamic.ingress.tls.issuer | quote }}
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
+    {{- end }}
+
+    # Authentik forward auth (if enabled)
+    {{- if .Values.dynamic.ingress.authentik.enabled }}
+    nginx.ingress.kubernetes.io/auth-url: {{ .Values.dynamic.ingress.authentik.authUrl | quote }}
+    nginx.ingress.kubernetes.io/auth-signin: {{ .Values.dynamic.ingress.authentik.signIn | quote }}
+    nginx.ingress.kubernetes.io/auth-response-headers: "X-Authentik-Username,X-Authentik-Groups,X-Authentik-Email,X-Authentik-Name"
+    nginx.ingress.kubernetes.io/auth-snippet: |
+      proxy_set_header X-Forwarded-Host $http_host;
+    {{- end }}
+
+    # WebSocket support for VNC connections
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
+    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
+
+    # Large file upload support (for file manager)
+    nginx.ingress.kubernetes.io/client-max-body-size: "100m"
+    nginx.ingress.kubernetes.io/proxy-body-size: "100m"
+
+    # Custom server snippet for GitHub repo logging
+    nginx.ingress.kubernetes.io/server-snippet: |
+      location ~ ^/github/([^/]+/[^/]+) {
+        # Log the GitHub repo being accessed
+        access_log /var/log/nginx/devcontainer-access.log combined;
+
+        # Set additional headers for audit/monitoring
+        proxy_set_header X-GitHub-Repo-Requested https://github.com/$1;
+        proxy_set_header X-Request-Timestamp $time_iso8601;
+        proxy_set_header X-Client-IP $remote_addr;
+      }
+
+spec:
+  {{- if .Values.dynamic.ingress.tls.enabled }}
+  tls:
+  - hosts:
+    - {{ .Values.dynamic.ingress.host }}
+    secretName: {{ .Values.dynamic.ingress.tls.secretName | default (printf "%s-tls" (include "devcontainer.fullname" .)) }}
+  {{- end }}
+  rules:
+  - host: {{ .Values.dynamic.ingress.host }}
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: {{ include "devcontainer.fullname" . }}-routing-proxy
+            port:
+              number: 80
+{{- end }}