Add NetworkConfig app for RESTCONF and NETCONF device management

[bernarmn-mnb]

Summary

• Adds a new NetworkConfig Django app providing a sidebar tab for managing network devices via RESTCONF and NETCONF, following the same patterns as the existing SNMP module
• Implements Device, Credential (Fernet-encrypted secrets), and Profile models with full CRUD
• Includes a live Test Connection endpoint that attempts a RESTCONF GET or NETCONF hello against the device and updates its status badge in real time

Details

• Models: Device (vendor, hostname, REST/NETCONF ports, last status), Credential (Basic, Bearer Token, API Key — secrets encrypted at rest), Profile (JSON blob of YANG paths / REST endpoints)
• API: paginated GetDevices with search/sort/filter, full CRUD for all three models, TestDeviceConnection supporting RESTCONF and NETCONF
• UI: Devices, Credentials, and Profiles pages with slide-in modals, live status badges, and action menus — consistent with the SNMP UI
• Sidebar: "Network Config" collapsible section added between SNMP and Utilities
• Migration: 0001_initial included

Test plan

• Run python manage.py migrate — should apply NetworkConfig.0001_initial cleanly
• Navigate to /NetworkConfig/Devices/ — empty state shown, "Add Device" opens modal
• Add a credential, then add a device referencing it
• Click Test on a device — status badge updates to Reachable/Unreachable
• Add a profile with valid JSON — saved and listed in the Profiles tab
• Edit and delete each entity type
• Confirm sidebar "Network Config" section highlights correctly on each sub-page

Dependencies

To enable NETCONF testing, add to requirements.txt:

ncclient==0.6.15

RESTCONF testing works out of the box via the existing requests library.

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