Go: unify three services into one binary (#16462)

### Summary

Plan to start api_server, admin_server and ingestor in one binary:
- ./ragflow_main --admin
- ./ragflow_main --api
- ./ragflow_main --ingestor

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

build.sh

@@ -14,9 +14,7 @@ PROJECT_ROOT="$SCRIPT_DIR"
 # Build directories
 CPP_DIR="$PROJECT_ROOT/internal/cpp"
 BUILD_DIR="$CPP_DIR/cmake-build-release"
-RAGFLOW_SERVER_BINARY="$PROJECT_ROOT/bin/ragflow_server"
-ADMIN_SERVER_BINARY="$PROJECT_ROOT/bin/admin_server"
-INGESTOR_BINARY="$PROJECT_ROOT/bin/ingestor"
+RAGFLOW_MAIN_BINARY="$PROJECT_ROOT/bin/ragflow_main"
 RAGFLOW_CLI_BINARY="$PROJECT_ROOT/bin/ragflow-cli"
 
 # Strip symbols from Go binaries (set via --strip / -s)
@@ -46,7 +44,10 @@ _seed_from_system() {
     local dep_dir="${HOME}/ragflow-native-libs/${dep_name}"
     local sys_dir="${SYSTEM_DEPS}/${dep_name}"
 
+    echo "check if dep ${dep_name} exists in ${dep_dir} or ${sys_dir}"
+
     if [ -d "$dep_dir" ]; then
+        echo "  ${dep_name} → ${dep_dir} (user cache)"
         return 0  # already cached
     fi
     if [ -d "$sys_dir" ]; then
@@ -55,6 +56,7 @@ _seed_from_system() {
         cp -r "$sys_dir" "$dep_dir"
         return 0
     fi
+    echo "  ${dep_name} not found in system or user cache"
     return 1
 }
 
@@ -299,39 +301,21 @@ build_go() {
     local strip_flags=()
     [ -n "$STRIP_SYMBOLS" ] && strip_flags=(-ldflags="-s -w")
 
-    echo "Building RAGFlow binary: $RAGFLOW_SERVER_BINARY, $ADMIN_SERVER_BINARY, $INGESTOR_BINARY, and $RAGFLOW_CLI_BINARY"
+    echo "Building RAGFlow binary: $RAGFLOW_MAIN_BINARY, and $RAGFLOW_CLI_BINARY"
     GOPROXY=${GOPROXY:-https://goproxy.cn,https://proxy.golang.org,direct} CGO_ENABLED=1 \
         CGO_CFLAGS="$CGO_CFLAGS" CGO_LDFLAGS="$CGO_LDFLAGS" \
-        go build "${strip_flags[@]}" -o "$RAGFLOW_SERVER_BINARY" cmd/server_main.go
-    GOPROXY=${GOPROXY:-https://goproxy.cn,https://proxy.golang.org,direct} CGO_ENABLED=1 \
-        CGO_CFLAGS="$CGO_CFLAGS" CGO_LDFLAGS="$CGO_LDFLAGS" \
-        go build "${strip_flags[@]}" -o "$ADMIN_SERVER_BINARY" cmd/admin_server.go
-    GOPROXY=${GOPROXY:-https://goproxy.cn,https://proxy.golang.org,direct} CGO_ENABLED=1 \
-        CGO_CFLAGS="$CGO_CFLAGS" CGO_LDFLAGS="$CGO_LDFLAGS" \
-        go build "${strip_flags[@]}" -o "$INGESTOR_BINARY" cmd/ingestor.go
+        go build "${strip_flags[@]}" -o "$RAGFLOW_MAIN_BINARY" cmd/ragflow_main.go
     GOPROXY=${GOPROXY:-https://goproxy.cn,https://proxy.golang.org,direct} CGO_ENABLED=1 \
         CGO_CFLAGS="$CGO_CFLAGS" CGO_LDFLAGS="$CGO_LDFLAGS" \
         go build "${strip_flags[@]}" -o "$RAGFLOW_CLI_BINARY" cmd/ragflow-cli.go
 
-    if [ ! -f "$RAGFLOW_SERVER_BINARY" ]; then
-        echo -e "${RED}Error: Failed to build RAGFlow server binary${NC}"
+    if [ ! -f "$RAGFLOW_MAIN_BINARY" ]; then
+        echo -e "${RED}Error: Failed to build RAGFlow main binary${NC}"
         exit 1
     fi
 
-    if [ ! -f "$ADMIN_SERVER_BINARY" ]; then
-        echo -e "${RED}Error: Failed to build Admin server binary${NC}"
-        exit 1
-    fi
-
-    if [ ! -f "$INGESTOR_BINARY" ]; then
-        echo -e "${RED}Error: Failed to build Ingestor binary${NC}"
-        exit 1
-    fi
-
-    echo -e "${GREEN}✓ Go ragflow_server built successfully: $RAGFLOW_SERVER_BINARY${NC}"
-    echo -e "${GREEN}✓ Go admin_server built successfully: $ADMIN_SERVER_BINARY${NC}"
+    echo -e "${GREEN}✓ Go ragflow_main built successfully: $RAGFLOW_MAIN_BINARY${NC}"
     echo -e "${GREEN}✓ Go ragflow-cli built successfully: $RAGFLOW_CLI_BINARY${NC}"
-    echo -e "${GREEN}✓ Go ingestor built successfully: $INGESTOR_BINARY${NC}"
 }
 
 # Configure CGO flags for native libraries (office_oxide, pdfium, pdf_oxide).
@@ -421,9 +405,7 @@ clean() {
     print_section "Cleaning build artifacts"
 
     rm -rf "$BUILD_DIR"
-    rm -f "$RAGFLOW_SERVER_BINARY"
-    rm -f "$ADMIN_SERVER_BINARY"
-    rm -f "$INGESTOR_BINARY"
+    rm -f "$RAGFLOW_MAIN_BINARY"
     rm -f "$RAGFLOW_CLI_BINARY"
 
     echo -e "${GREEN}✓ Build artifacts cleaned${NC}"
@@ -431,16 +413,8 @@ clean() {
 
 # Run the server
 run() {
-    if [ ! -f "$ADMIN_SERVER_BINARY" ]; then
-        echo -e "${RED}Error: $ADMIN_SERVER_BINARY not found. Build first with --all or --go${NC}"
-        exit 1
-    fi
-    if [ ! -f "$RAGFLOW_SERVER_BINARY" ]; then
-        echo -e "${RED}Error: $RAGFLOW_SERVER_BINARY not found. Build first with --all or --go${NC}"
-        exit 1
-    fi
-    if [ ! -f "$INGESTOR_BINARY" ]; then
-        echo -e "${RED}Error: $INGESTOR_BINARY not found. Build first with --all or --go${NC}"
+    if [ ! -f "$RAGFLOW_MAIN_BINARY" ]; then
+        echo -e "${RED}Error: $RAGFLOW_MAIN_BINARY not found. Build first with --all or --go${NC}"
         exit 1
     fi
 
@@ -449,7 +423,7 @@ run() {
     # admin_server must be running before ragflow_server, otherwise ragflow_server's
     # heartbeats to admin will error out (see internal/development.md).
     print_section "Starting admin server (background)"
-    "$ADMIN_SERVER_BINARY" &
+    "$RAGFLOW_MAIN_BINARY" --admin &
     ADMIN_PID=$!
     trap 'kill "$ADMIN_PID" 2>/dev/null || true' EXIT INT TERM
 
@@ -458,13 +432,13 @@ run() {
     sleep 1
 
     print_section "Starting ingestor (background)"
-    "$INGESTOR_BINARY" &
+    "$RAGFLOW_MAIN_BINARY" --ingestor &
     INGESTOR_PID=$!
     trap 'kill "$INGESTOR_PID" 2>/dev/null || true' EXIT INT TERM
     sleep 1
 
     print_section "Starting RAGFlow server (foreground)"
-    "$RAGFLOW_SERVER_BINARY"
+    "$RAGFLOW_MAIN_BINARY" -- api
 }
 
 # Show help
@@ -566,7 +540,7 @@ main() {
             build_cpp
             build_go
             echo -e "\n${GREEN}=== Build completed successfully! ===${NC}"
-            echo "Binary: $RAGFLOW_SERVER_BINARY, $ADMIN_SERVER_BINARY, $INGESTOR_BINARY, $RAGFLOW_CLI_BINARY"
+            echo "Binary: $RAGFLOW_MAIN_BINARY, $RAGFLOW_CLI_BINARY"
             ;;
         *)
             echo -e "${RED}Unknown option: $1${NC}"