feat(agent): ship the Go agent canvas port — eino interrupt/resume + Redis check-pointing (#16035)

Replaces the Python agent canvas runtime with a Go implementation that
runs inside `cmd/server_main`.

The canvas compiles into an eino Workflow that pauses on wait-for-user
via native Interrupt/Resume (no sentinel flag) and resumes from a
Redis-backed CheckPointStore.

All 21 Python agent components and ~35 tools are ported with functional
parity.

Sandbox providers now read their JSON config from the admin-panel
system_settings table with env fallback.

234 files / +35,413 / -6,111. All Go files are gofmt-clean (CI gate
added); drops the v2 DSL E2E step and the gap-analysis plan (both
redundant after the port ships).

## Type of change

- [x] Refactoring
- [x] New feature
- [x] Bug fix

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

docker/entrypoint.sh

@@ -294,12 +294,12 @@ if [[ "${ENABLE_WEBSERVER}" -eq 1 ]]; then
         sleep 1;
     done &
 
-    if [[ "${API_PROXY_SCHEME}" == "hybrid" ]]; then
+    if [[ "${API_PROXY_SCHEME}" == "hybrid" ]] || [[ "${API_PROXY_SCHEME}" == "go" ]]; then
         while true; do
             echo "Attempt to start RAGFlow go server..."
             wait_for_server "http://127.0.0.1:9380/api/v1/system/healthz" "ragflow_server"
             echo "Starting RAGFlow go server..."
-            bin/server_main
+            bin/ragflow_server
             sleep 1;
         done &
     fi
@@ -314,7 +314,7 @@ if [[ "${ENABLE_ADMIN_SERVER}" -eq 1 ]]; then
         sleep 1;
     done &
 
-    if [[ "${API_PROXY_SCHEME}" == "hybrid" ]]; then
+    if [[ "${API_PROXY_SCHEME}" == "hybrid" ]] || [[ "${API_PROXY_SCHEME}" == "go" ]]; then
         while true; do
             echo "Attempt to starting Admin go server..."
             wait_for_server "http://127.0.0.1:9381/api/v1/admin/ping" "admin_server"

docker/launch_backend_service.sh

@@ -150,7 +150,6 @@ run_admin_server(){
             sleep 2
         fi
     done
-
     if [ $retry_count -ge $MAX_RETRIES ]; then
         echo "admin_server.py failed after $MAX_RETRIES attempts. Exiting..." >&2
         cleanup
@@ -269,5 +268,12 @@ if [[ "$START_DATA_SYNC" -eq 1 ]]; then
   PIDS+=($!)
 fi
 
+# Start the Python admin server (9381) when ENABLE_ADMIN_SERVER=1
+run_admin_server &
+PIDS+=($!)
+
+# Start the Go server(s) when running in hybrid or go mode
+run_go_servers
+
 # Wait for all background processes to finish
 wait

docker/nginx/ragflow.conf.golang

@@ -21,7 +21,7 @@ server {
     }
 
     location ~ ^/(v1|api) {
-        proxy_pass http://127.0.0.1:9382;
+        proxy_pass http://127.0.0.1:9384;
         include proxy.conf;
     }