Fixes and new features from a couple months of daily driving (v2.7)

[Bouteillepleine]

Hey! First off, thanks for this module — been using it daily on my OnePlus (OxygenOS 15, dual SIM, KernelSU) for a couple of months now. Along the way I ended up fixing a bunch of things and adding some features, and figured it was about time I sent it back upstream instead of sitting on it :)

Everything here has been verified live on-device.

The most important fixes:

• initcwnd/initrwnd and the per-route congctl were only written to the main table, but Android keeps the default route in the per-interface table — so they never actually applied to internet traffic. I only caught this because the pin was sitting on the LAN subnet route and nothing else.
• qdisc checks used a bare grep, so fq happily matched fq_codel — apply reported success and the monitor never fired.
• switching bbr3 → bbr left stale congctl bbr3 pins on routes (the "already pinned" glob matches bbr against bbr3).
• VoWiFi detection never matches on OxygenOS/ColorOS — their SystemUI doesn't print the AOSP slot='vowifi' line at all, so every wifi join just ate the full 20s timeout. Added the OPlus pattern and kept the AOSP one as fallback.
• the cellular signal read the first level= in the telephony dump, which is the dead CDMA block — dual SIM phones sit at "poor" forever. Now it reads real dBm (RSRP/ssRsrp) from the active-data SIM's primary RAT.
• the boot sysctl block overwrote ROM-tuned tcp_rmem/tcp_wmem min/default with fixed values — made it raise-only so it never downgrades what the ROM already tuned.
• manual settings didn't stick while on wifi (force_apply was gated behind the VoWiFi connect timer, and re-tapping kept resetting it).
• upgrades silently wiped user settings — everything is preserved now.
• dropped system.prop: those are Android props nothing consumes, the real values are the sysctls the scripts set, and the stale props just confuse debugging.
• tun/ppp/wg interfaces now resolve to the underlying wlan/rmnet.

New stuff:

• a Tools tab: Auto-Optimize (benchmarks every CC the kernel exposes and picks a winner), an A/B duel between two CCs, a live BBR bandwidth/RTT graph from debugfs (mounted automatically when absent — Android 11+ doesn't mount it), and a bufferbloat test. The bloat test pulls from multiple mirrors in parallel because a single mirror under-saturates fast links — I was measuring ~88% of link speed on one server vs ~97% with three.
• a Results tab that keeps a history of test runs (connection type, cc, qdisc, signal, download, pings, grade) across upgrades.
• an opt-in "Advanced TCP buffers" toggle, also raise-only.
• the qdisc monitor grew into a full drift guard: it now also watches global cc, the route pins and buffer ceilings, logs what drifted, and re-asserts quietly without ss -K so it never kills live connections. It also pauses itself while a WebUI test runs — otherwise it fights the Auto-Optimize probes and corrupts the scores (watched that happen live, four reverts in one run). And the qdisc match is anchored to the root line, since a foreign root with a matching leaf underneath used to pass.

One heads up: my local history predates your module/ restructure, so this comes as one squashed commit rebuilt on top of your current main. Totally happy to split things out or adjust anything to your taste — and if some of it feels too OnePlus-specific just say so, the OPlus detection bits all fall back to the AOSP behavior.