fix: don't send Content-Type on bodyless DELETE, include full server data in project queries

- Only set Content-Type: application/json when request body is present (fixes
  Fastify rejecting empty DELETE with "Body cannot be empty" 400 error)
- Changed PROJECT_INCLUDE to return full server objects instead of just {id, name}
  so project server listings show transport, package, image columns

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcpd/src/repositories/project.repository.ts

@@ -1,11 +1,11 @@
 import type { PrismaClient, Project } from '@prisma/client';
 
 export interface ProjectWithRelations extends Project {
-  servers: Array<{ id: string; server: { id: string; name: string } }>;
+  servers: Array<{ id: string; projectId: string; serverId: string; server: Record<string, unknown> & { id: string; name: string } }>;
 }
 
 const PROJECT_INCLUDE = {
-  servers: { include: { server: { select: { id: true, name: true } } } },
+  servers: { include: { server: true } },
 } as const;
 
 export interface IProjectRepository {