Add proxy-rewrite plugin to remove /api prefix

Added proxy-rewrite plugin to strip /api prefix from requests before
forwarding to backend API microservice. The API service is a standalone
microservice that expects requests without the /api prefix.

Changes:
- Added proxy-rewrite plugin to both API routes:
  * /api/llm/* route (priority 20)
  * /api/* route (priority 10)
- Uses regex_uri to rewrite: /api/endpoint -> /endpoint

Example transformations:
- /api/health -> /health
- /api/users/123 -> /users/123
- /api/llm/chat -> /llm/chat

Plugin configuration:
  proxy-rewrite:
    regex_uri:
      - "^/api/(.*)"
      - "/$1"

This allows the API microservice to work independently without
needing to handle the /api prefix in its routes.

Reference: https://docs.api7.ai/hub/proxy-rewrite/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

helm/api7ee-demo-k8s/templates/configmap-adc.yaml

@@ -92,6 +92,11 @@ data:
               redirect:
                 http_to_https: true
               {{- end }}
+              # Remove /api prefix before forwarding to backend
+              proxy-rewrite:
+                regex_uri:
+                  - "^/api/(.*)"
+                  - "/$1"
               {{- if .Values.api7.plugins.cors.enabled }}
               cors:
                 allow_origins: {{ .Values.api7.plugins.cors.allowOrigins | join "," | quote }}
@@ -120,6 +125,11 @@ data:
               redirect:
                 http_to_https: true
               {{- end }}
+              # Remove /api prefix before forwarding to backend
+              proxy-rewrite:
+                regex_uri:
+                  - "^/api/(.*)"
+                  - "/$1"
               {{- if .Values.api7.plugins.cors.enabled }}
               cors:
                 allow_origins: {{ .Values.api7.plugins.cors.allowOrigins | join "," | quote }}