Add state to MCP profile and refactor contract filter

Add the profile state attribute (ACTIVE/INACTIVE) to the MCP
Profile schema so listUsers and getUser tools expose it, and
add a state filter to listUsers.

Rename excludeContractEnded to contractEnded across the entire
stack (MCP, GraphQL, CLI, frontend). The new boolean is two-way:
true returns only users with ended contracts, false returns only
users with active or no contract, and null returns all.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/server/api/connect/v1/identity_resolvers.go

@@ -30,7 +30,7 @@ func (r *identityResolver) Profiles(ctx context.Context, obj *types.Identity, fi
 
 	filters := coredata.NewMembershipProfileFilter(nil).WithMembership()
 	if filter != nil {
-		filters = coredata.NewMembershipProfileFilter(filter.ExcludeContractEnded).WithMembership()
+		filters = coredata.NewMembershipProfileFilter(filter.ContractEnded).WithMembership()
 		if filter.State != nil {
 			filters.WithState(*filter.State)
 		}