feat: native WireView Pro II monitoring (detection, serial protocol, live tab)

Standalone support for the ThermalGrizzly WireView Pro II without
depending on the external wireview_reporter exporter:

- wireview.py: serial protocol (STX/ETX + 16-bit CRC16-CCITT) with
  vendor-data product identification, config version, UID, build
  string, screen layout, and temperature/power/current sensor reads;
  hwmon fallback with per-channel index resolution; udev-based
  detection (vendor 0x2560 / product 0x0101) with fallback port
  probing; serial read timeout and watchdog reconnect
- server.py: startup detection (root only), 1 Hz poller gated on
  subscribed clients, WS 'wireview' channel, GET /api/wireview,
  rejected-product memoization, stale-read race guard
- frontend: WireView tab (visible when a device is detected) with
  live temperature/power/current cards, sparkline history, and
  device info; nullable temp channels
- tests: 76 tests covering parser, CRC, fault classification,
  hwmon resolution, JSON safety, and the serial transport against
  a pty-based fake device

Verified live: tab appears with the device connected, disappears
when unplugged, reconnects on re-plug, no serial traffic when idle.

frontend/src/types.ts

@@ -145,3 +145,50 @@ export interface ProfileData {
   fan_curve: FanPoint[] | null;
   fan_targets: number[] | null;
 }
+
+// ── WireView Pro II (Thermal Grizzly 12 VHPWR connector monitor) ──
+
+export interface WireViewPin {
+  voltage_v: number;
+  current_a: number;
+  power_w: number;
+}
+
+export interface WireViewSample {
+  timestamp: number;
+  power_total_w: number;
+  current_total_a: number;
+  voltage_avg_v: number;
+  pins: WireViewPin[];
+  // Temperatures are null when the source has no channel for them
+  // (e.g. an hwmon module without external-sensor channels).
+  temp_in_c: number | null;
+  temp_out_c: number | null;
+  temp_ext1_c: number | null;
+  temp_ext2_c: number | null;
+  fan_duty_pct: number;
+  fault_status: number;
+  fault_log: number;
+  psu_capability_w: number;
+}
+
+export interface WireViewInfo {
+  device_name: string;
+  hw_rev: string;
+  firmware_version: string;
+  uid: string;
+  build: string;
+  transport: "serial" | "hwmon";
+  port: string;
+}
+
+export interface WireViewState {
+  available: boolean;
+  connected: boolean;
+  info: WireViewInfo | null;
+  sample: WireViewSample | null;
+}
+
+export type WireViewWsMessage =
+  | { type: "unavailable" }
+  | { type: "sample"; info: WireViewInfo; sample: WireViewSample };