feat (search): add dynamic search field metadata foundation for database-driven search configuration (#14469)

## Summary

Implements the foundation for dynamic search field configuration from
[issue #1428](https://github.com/twentyhq/core-team-issues/issues/1428).

## Changes

- Add `SearchFieldMetadataEntity` junction table for storing searchable
field configurations
- Add `SearchFieldMetadataService` with core CRUD operations  
- Add `SearchFieldMetadataModule` following existing patterns  
- Add `IS_DYNAMIC_SEARCH_FIELDS_ENABLED` feature flag (defaults to
`false`)
- Database migration with proper indexes and foreign keys  

## Architecture

Uses a junction table where **record existence = field is searchable**:

**Table: `searchFieldMetadata(objectMetadataId, fieldMetadataId,
workspaceId)`**

- Unique constraint on `(objectMetadataId, fieldMetadataId)`  
- `ON DELETE CASCADE` on foreign keys  

## Testing

- [x] Migration runs successfully  
- [x] Table created with correct schema  
- [x] Feature flag seeded properly  
- [x] Database reset works correctly  

## Next Steps

Future PRs will handle:

- Data migration from existing hardcoded search field configs  
- Integration with search services  

✅ No breaking changes — fully backward compatible.

packages/twenty-server/src/engine/metadata-modules/metadata-engine.module.ts

@@ -7,6 +7,7 @@ import { ObjectMetadataModule } from 'src/engine/metadata-modules/object-metadat
 import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
 import { RemoteServerModule } from 'src/engine/metadata-modules/remote-server/remote-server.module';
 import { RoleModule } from 'src/engine/metadata-modules/role/role.module';
+import { SearchFieldMetadataModule } from 'src/engine/metadata-modules/search-field-metadata/search-field-metadata.module';
 import { ServerlessFunctionModule } from 'src/engine/metadata-modules/serverless-function/serverless-function.module';
 import { WorkspaceMetadataVersionModule } from 'src/engine/metadata-modules/workspace-metadata-version/workspace-metadata-version.module';
 import { WorkspaceMigrationModule } from 'src/engine/metadata-modules/workspace-migration/workspace-migration.module';
@@ -17,6 +18,7 @@ import { RouteModule } from 'src/engine/metadata-modules/route/route.module';
     DataSourceModule,
     FieldMetadataModule,
     ObjectMetadataModule,
+    SearchFieldMetadataModule,
     ServerlessFunctionModule,
     AgentModule,
     WorkspaceMetadataVersionModule,
@@ -31,6 +33,7 @@ import { RouteModule } from 'src/engine/metadata-modules/route/route.module';
     DataSourceModule,
     FieldMetadataModule,
     ObjectMetadataModule,
+    SearchFieldMetadataModule,
     ServerlessFunctionModule,
     AgentModule,
     RemoteServerModule,

packages/twenty-server/src/engine/metadata-modules/search-field-metadata/search-field-metadata.entity.ts

@@ -0,0 +1,55 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  JoinColumn,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+  Relation,
+  Unique,
+  UpdateDateColumn,
+} from 'typeorm';
+
+import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
+import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
+
+@Entity('searchFieldMetadata')
+@Unique('IDX_SEARCH_FIELD_METADATA_OBJECT_FIELD_UNIQUE', [
+  'objectMetadataId',
+  'fieldMetadataId',
+])
+@Index('IDX_SEARCH_FIELD_METADATA_WORKSPACE_ID', ['workspaceId'])
+@Index('IDX_SEARCH_FIELD_METADATA_OBJECT_METADATA_ID', ['objectMetadataId'])
+export class SearchFieldMetadataEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ nullable: false, type: 'uuid' })
+  objectMetadataId: string;
+
+  @ManyToOne(() => ObjectMetadataEntity, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'objectMetadataId' })
+  objectMetadata: Relation<ObjectMetadataEntity>;
+
+  @Column({ nullable: false, type: 'uuid' })
+  fieldMetadataId: string;
+
+  @ManyToOne(() => FieldMetadataEntity, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'fieldMetadataId' })
+  fieldMetadata: Relation<FieldMetadataEntity>;
+
+  @CreateDateColumn({ type: 'timestamptz' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ type: 'timestamptz' })
+  updatedAt: Date;
+
+  @Column({ nullable: false, type: 'uuid' })
+  workspaceId: string;
+
+  @ManyToOne(() => Workspace, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'workspaceId' })
+  workspace: Relation<Workspace>;
+}

packages/twenty-server/src/engine/metadata-modules/search-field-metadata/search-field-metadata.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { SearchFieldMetadataEntity } from 'src/engine/metadata-modules/search-field-metadata/search-field-metadata.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([SearchFieldMetadataEntity])],
+  providers: [],
+  exports: [],
+})
+export class SearchFieldMetadataModule {}