feat: teams within a project

Projects keep teams of members in their settings (settings.teams; people
outside the project are dropped, teams are archived, not removed; absent
when saving means unchanged). Tickets go to a team (`team`, also filtered
in the list and in MCP search_issues), and a comment mentioning
@[Frontend](team-FRONT) tells each of its members. Settings has the teams
with their members, the ticket a «Equipo» select, the list a team filter,
and «@» offers the teams after the people.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/graphql/inputs.ts

@@ -128,6 +128,11 @@ abstract class IssueFieldsInput {
   @Matches(SETTING_ID)
   area?: string | null;
 
+  @Field(() => String, { nullable: true, description: 'A team id' })
+  @IsOptional()
+  @Matches(SETTING_ID)
+  team?: string | null;
+
   @Field(() => IssuePriority, { nullable: true })
   @IsOptional()
   @IsEnum(IssuePriority)
@@ -515,6 +520,10 @@ export class IssueFilterInput {
   @IsOptional()
   @IsString({ each: true })
   areas?: string[];
+  @Field(() => [String], { nullable: true, description: 'Team ids' })
+  @IsOptional()
+  @IsString({ each: true })
+  teams?: string[];
   @Field(() => [IssuePriority], { nullable: true })
   @IsOptional()
   @IsEnum(IssuePriority, { each: true })
@@ -712,6 +721,18 @@ export class AreaOptionInput {
   @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
 }
 
+@InputType()
+export class TeamInput {
+  @Field() @Matches(SETTING_ID) id!: string;
+  @Field() @IsString() @MinLength(1) @MaxLength(40) name!: string;
+  @Field(() => [ID], { defaultValue: [] })
+  @IsArray()
+  @ArrayMaxSize(200)
+  @IsString({ each: true })
+  memberIds!: string[];
+  @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
+}
+
 @InputType()
 export class CustomFieldDefinitionInput {
   @Field() @Matches(SETTING_ID) id!: string;
@@ -773,6 +794,17 @@ export class ProjectSettingsInput {
   @Type(() => CustomFieldDefinitionInput)
   customFields?: CustomFieldDefinitionInput[];
 
+  @Field(() => [TeamInput], {
+    nullable: true,
+    description: 'Absent: unchanged. Teams cannot be removed: archive them.',
+  })
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(30)
+  @ValidateNested({ each: true })
+  @Type(() => TeamInput)
+  teams?: TeamInput[];
+
   @Field({
     nullable: true,
     description: