Wire up organization client endpoints into OrganizationsClientsSection

[Copilot]

IOrganizationsClientOverview and IOrganizationBandwidthUsageHistory interfaces existed but were never wired into MerakiClient or OrganizationsSection. The IOrganizationsClients (search) was wired as a flat interface rather than a proper section.

Changes

• New OrganizationsClientsSection — Groups all three client interfaces following the NetworksClientsSection pattern. Uses [RefitPromoteCalls] on the internal IOrganizationsClients for backward compatibility.
• OrganizationsSection.Clients — Changed from IOrganizationsClients to OrganizationsClientsSection
• MerakiClient wiring — Wires up Clients, BandwidthUsageHistory, and Overview

Existing consumer code is unaffected:

// Still works — promoted via source generator
client.Organizations.Clients.GetOrganizationClientsSearchAsync(orgId, mac);

// Now also available
client.Organizations.Clients.Overview.GetOrganizationClientsOverviewAsync(orgId, t0, t1);
client.Organizations.Clients.BandwidthUsageHistory.GetOrganizationClientsBandwidthUsageHistoryAsync(orgId, t0, t1);

[codacy-production]

Not up to standards ⛔

🔴 Issues 1 minor

Alerts:
⚠ 1 issue (≤ 0 issues of at least minor severity)

Results:
1 new issue

Category	Results
CodeStyle	1 minor

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