feat: directly add customer service friend

internal/imclient/client.go

@@ -107,6 +107,11 @@ type Conversation struct {
 	CanSend      bool   `json:"can_send"`
 }
 
+type DirectFriendResult struct {
+	Relationship string `json:"relationship"`
+	Topic        string `json:"topic"`
+}
+
 func New(cfg config.IMConfig) *Client {
 	timeout := cfg.Timeout
 	if timeout <= 0 {
@@ -229,6 +234,18 @@ func (c *Client) CreateFriendRequest(ctx context.Context, token, userID, idempot
 	return &out, err
 }
 
+// AddFriendDirect establishes a trusted server-side friendship without
+// creating a user-visible friend request. The IM internal API authenticates
+// this operation with the configured internal secret.
+func (c *Client) AddFriendDirect(ctx context.Context, userID, peerUserID string) (*DirectFriendResult, error) {
+	var out DirectFriendResult
+	path := "/internal/admin-query/tenants/" + url.PathEscape(c.cfg.TenantCode) + "/friends/direct"
+	err := c.internalJSON(ctx, http.MethodPost, path, map[string]any{
+		"user_id": userID, "peer_user_id": peerUserID,
+	}, &out)
+	return &out, err
+}
+
 func (c *Client) EnsureP2P(ctx context.Context, token, userID, idempotencyKey string) (*Conversation, error) {
 	var out Conversation
 	err := c.productJSON(ctx, http.MethodPost, "/conversations/p2p", token, idempotencyKey,