perf(webapp): look up environments by indexed organization column

The metric endpoint built its environment field mappings with a
`where: { project: { organizationId } }` filter, which joins through the
projects table on every request. RuntimeEnvironment has its own non-null,
indexed organizationId column that is always set to the same organization
as the environment's project, so filter on it directly instead.

Returns the same set of environments with less work per request.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6byUe71HjFpnGAsicw7Hy

Author: claude

.server-changes/narrow-metric-environment-lookup.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: improvement
+---
+
+Dashboard charts load with less database work behind the scenes

apps/webapp/app/services/queryService.server.ts

@@ -359,7 +359,8 @@ export async function executeQuery<TOut extends z.ZodSchema>(
     });
 
     const environments = await prisma.runtimeEnvironment.findMany({
-      where: { project: { organizationId } },
+      // Same set as filtering through `project`, but hits the indexed column without the join.
+      where: { organizationId },
       select: { id: true, slug: true },
     });