Feature/api coverage expansion

[CyberneticCodeComposer]

Summary

Adds API coverage for monitoring, services, and scope management endpoints that were previously unimplemented in pycentral v2.

New modules:

• new_monitoring/switches.py — MonitoringSwitches: list/details/ports/stacks/VLANs/CPU and memory utilization trends for switches
• new_monitoring/alerts.py — Alerts: paginated alert list and detail retrieval via network-notifications/v1
• new_monitoring/reporting.py — Reporting: full CRUD for saved reports and run history via network-monitoring/v1alpha1
• new_monitoring/location.py — LocationServices: device locations, AP ranging scans, and asset tag data via network-monitoring/v1alpha2
• new_monitoring/location_analytics.py — LocationAnalytics: location trends and per-site insights
• new_monitoring/floorplan.py — FloorPlan: buildings, floors (create/update/scale/import), wall types, walls, zones, device placement, and heatmaps
• services/ (new package) — Webhooks (full CRUD + HMAC key rotation), FirmwareService (firmware details list), AuditTrail (event list with time-range
  filtering and event details) via network-services/v1
• scopes/device_group_api.py — DeviceGroupAPI: create, update, delete (single and bulk), and add/remove devices for
  network-config/v1alpha1/device-collections — completing the write-side of device group management that was previously read-only

Supporting changes:

• utils/url_utils.py: added v1alpha2 to the supported versions list; added notifications (network-notifications) and services (network-services) URL
  categories
• All new classes exported from their respective package init.py files
• PLAN.md: documents remaining work (Phase 5 — typed config profile wrappers; Phase 6 — Central NAC package) for follow-on PRs
• CLAUDE.md: adds repo guidance for Claude Code

Test plan

• Verify from pycentral.new_monitoring import MonitoringSwitches, Alerts, Reporting, LocationServices, LocationAnalytics, FloorPlan resolves
  correctly
• Verify from pycentral.services import Webhooks, FirmwareService, AuditTrail resolves correctly
• Verify from pycentral.scopes import DeviceGroupAPI resolves correctly
• Test MonitoringSwitches.get_all_switches() against a Central environment with switches
• Test Alerts.get_all_alerts() and confirm pagination works
• Test DeviceGroupAPI.create_device_group() / delete_device_group() round-trip
• Test Webhooks.create_webhook() / delete_webhook() round-trip
• Test FloorPlan.get_buildings() against an environment with floor plans configured