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364ff93783
practice for multi-vendor device support
Refactor Nornir configuration to use host-level connection_options
instead of dynamic groups, following Nornir's configuration priority
model (host > group > defaults).
**Problem:**
Previous implementation used first device's configuration for all
devices, causing Cisco devices to use Huawei driver and vice versa.
**Solution:**
- Each host now has device-specific connection_options at host level
- Single generic "network_devices" group for shared settings
- Host-level config automatically overrides group-level config
**Changes:**
- Remove: _get_nornir_groups_config() helper function
- Remove: _get_nornir_group() helper function
- Simplify: _initialize_nornir() to use single generic group
- Update: get_gns3_device_port.py() to return host-level config
- Reserve: platform field for future NAPALM/scrapli plugin support
**Benefits:**
- Cleaner code structure (no dynamic group creation)
- Follows Nornir best practice ("configuration proximity")
- Easy to extend with new device types
- Properly handles mixed-vendor topologies