fix(social): robot blocks

Blocking an auto-match opponent who is secretly a pooled robot is recorded  instead in a separate `robot_blocks` table.

Now blocking behaves the same in that game (struck name, hidden composer) and lists the blocked opponent under the name you saw, but is recorded only against that game — the disguise holds, the shared robot is never globally blocked, and the matchmaker keeps pairing you with robots (so you can never block yourself out of opponents).

- the shared robot account is never put in `blocks`
- the matchmaker keeps it free and it is not blocked under its other per-game names
- the blocked list and the in-game card still show it by joining that table; an unblock deletes the row

pkg/fbs/scrabblefb/RobotBlockRef.go

@@ -0,0 +1,97 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package scrabblefb
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+)
+
+type RobotBlockRef struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsRobotBlockRef(buf []byte, offset flatbuffers.UOffsetT) *RobotBlockRef {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &RobotBlockRef{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func FinishRobotBlockRefBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.Finish(offset)
+}
+
+func GetSizePrefixedRootAsRobotBlockRef(buf []byte, offset flatbuffers.UOffsetT) *RobotBlockRef {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &RobotBlockRef{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func FinishSizePrefixedRobotBlockRefBuffer(builder *flatbuffers.Builder, offset flatbuffers.UOffsetT) {
+	builder.FinishSizePrefixed(offset)
+}
+
+func (rcv *RobotBlockRef) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *RobotBlockRef) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *RobotBlockRef) Id() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func (rcv *RobotBlockRef) DisplayName() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(6))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func (rcv *RobotBlockRef) GameId() []byte {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(8))
+	if o != 0 {
+		return rcv._tab.ByteVector(o + rcv._tab.Pos)
+	}
+	return nil
+}
+
+func (rcv *RobotBlockRef) Seat() int32 {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(10))
+	if o != 0 {
+		return rcv._tab.GetInt32(o + rcv._tab.Pos)
+	}
+	return 0
+}
+
+func (rcv *RobotBlockRef) MutateSeat(n int32) bool {
+	return rcv._tab.MutateInt32Slot(10, n)
+}
+
+func RobotBlockRefStart(builder *flatbuffers.Builder) {
+	builder.StartObject(4)
+}
+func RobotBlockRefAddId(builder *flatbuffers.Builder, id flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(id), 0)
+}
+func RobotBlockRefAddDisplayName(builder *flatbuffers.Builder, displayName flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(1, flatbuffers.UOffsetT(displayName), 0)
+}
+func RobotBlockRefAddGameId(builder *flatbuffers.Builder, gameId flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(2, flatbuffers.UOffsetT(gameId), 0)
+}
+func RobotBlockRefAddSeat(builder *flatbuffers.Builder, seat int32) {
+	builder.PrependInt32Slot(3, seat, 0)
+}
+func RobotBlockRefEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}