Add an admin switch for place enrichment

Reads fail-open, unlike the three older places_* switches. Those read
=== 'true', which is why migration 185 had to backfill a row on every existing
install; there is nothing here that warrants repeating that.

The three hand-rolled toggles next to it move to ToggleSwitch while I am in
there - they were bare buttons with an inline transform and no aria-pressed or
label, so a screen reader could not tell their state.

server/src/nest/admin/admin.controller.ts

@@ -213,6 +213,16 @@ export class AdminController {
     return result;
   }
 
+  @Get('places-enrich')
+  getPlacesEnrich() { return this.admin.getPlacesEnrich(); }
+
+  @Put('places-enrich')
+  updatePlacesEnrich(@CurrentUser() user: User, @Body() body: AdminFeatureToggleDto, @Req() req: Request) {
+    const result = this.admin.updatePlacesEnrich(body.enabled);
+    this.audit.writeAudit({ userId: user.id, action: 'admin.places_enrich', ip: getClientIp(req), details: { enabled: result.enabled } });
+    return result;
+  }
+
   @Get('collab-features')
   getCollabFeatures() { return this.addons.getCollabFeatures(); }