net: generate OpenWrt config and calibrate WAN weights

[lePereT]

What type of PR is this? (check all applicable)

• Feature
• Bug Fix
• Documentation Update
• Code Refactor
• Test

Description

Implements the next NET/OpenWrt integration pass: complete UCI ownership, bounded OpenWrt name generation, canonical GSM uplink state for NET, and event-led WAN speed testing.

Changes include:

• Adds a central OpenWrt name allocator so generated interface, device, firewall, dnsmasq and mwan3 names cannot exceed platform limits.
• Changes OpenWrt UCI apply to complete package rewrites for Devicecode-owned packages, including creation of missing /etc/config/* files before apply.
• Generates unconditional network baseline sections, including loopback and globals.
• Defaults LAN/system/user/guest segment realisation to bridge-backed VLAN devices, while keeping WAN/uplink segments direct by default.
• Groups dnsmasq instances by effective DNS policy and binds DHCP pools to their selected dnsmasq instance.
• Removes generated devicecode_* UCI watermark options; provider apply/plan now return openwrt_names mappings instead.
• Adds canonical GSM uplink state under state/gsm/uplink/<role>, while retaining the legacy state/gsm/modem/<role>/uplink topic for compatibility.
• Updates Big Box config to use gsm-uplink source identity for modem WAN members.
• Updates NET WAN runtime so speedtests are driven by observed mwan3 readiness rather than being started as a batch after apply.
• Applies live mwan3 weights from measured uplinks, with probe weights for unmeasured members.
• Adds semantic translation between NET member names and generated OpenWrt/mwan3 names.
• Updates NET and naming documentation for the new GSM uplink contract and OpenWrt provider behaviour.

Manual test

• yes

Manual test description

Confirmed the full test suite passes:

894 tests, 0 failed, 0 skipped

Also confirmed all OpenWrt VM tests pass.

Added tests?

• yes

Added to documentation?

• docs/naming.md
• docs/specs/net.md