feat(profile): carry linked identities in the profile (email, telegram, vk)

Add email / telegram_linked / vk_linked to the Profile (fbs table + regenerated
Go/TS bindings, gateway ProfileResp + encodeProfile, backend DTO, UI model +
decode). They are filled outside the pure projection — Server.profileResponse now
reads the account's identities (like the banner seam) — and will drive the profile's
Add / Unlink / change-email controls.

ui/src/gen/fbs/scrabblefb/profile.ts

@@ -107,8 +107,25 @@ variantPreferencesLength():number {
   return offset ? this.bb!.__vector_len(this.bb_pos + offset) : 0;
 }
 
+email():string|null
+email(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+email(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 30);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+telegramLinked():boolean {
+  const offset = this.bb!.__offset(this.bb_pos, 32);
+  return offset ? !!this.bb!.readInt8(this.bb_pos + offset) : false;
+}
+
+vkLinked():boolean {
+  const offset = this.bb!.__offset(this.bb_pos, 34);
+  return offset ? !!this.bb!.readInt8(this.bb_pos + offset) : false;
+}
+
 static startProfile(builder:flatbuffers.Builder) {
-  builder.startObject(13);
+  builder.startObject(16);
 }
 
 static addUserId(builder:flatbuffers.Builder, userIdOffset:flatbuffers.Offset) {
@@ -175,6 +192,18 @@ static startVariantPreferencesVector(builder:flatbuffers.Builder, numElems:numbe
   builder.startVector(4, numElems, 4);
 }
 
+static addEmail(builder:flatbuffers.Builder, emailOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(13, emailOffset, 0);
+}
+
+static addTelegramLinked(builder:flatbuffers.Builder, telegramLinked:boolean) {
+  builder.addFieldInt8(14, +telegramLinked, +false);
+}
+
+static addVkLinked(builder:flatbuffers.Builder, vkLinked:boolean) {
+  builder.addFieldInt8(15, +vkLinked, +false);
+}
+
 static endProfile(builder:flatbuffers.Builder):flatbuffers.Offset {
   const offset = builder.endObject();
   return offset;