feat(android+web/diagnostics): on-device debug reporter + admin timeline (M9)

Android: a gated DiagnosticsReporter taps connectivity, server-health,
UPnP drops/player-state/route, power (Doze/battery-opt/screen), and
app fg/bg, plus a heartbeat snapshotting Sonos-vs-local position — the
locked-phone desync signal. Events buffer in a Room ring buffer
(deliberately NOT the MutationQueue: high-volume best-effort telemetry
that must survive the dead zone being debugged) and DiagnosticsUploader
drains them on a tick / health-recovery / sign-in.

Gating: the account flag (users.debug_mode_enabled) reaches the device
via a new /api/me refresh in AuthController; a per-device local OFF
switch lives in Settings. Reporter runs only when enabled && !optOut;
disabling drops the unsent buffer.

Web admin: /admin/diagnostics — pick account+device+kind+time-window,
see a chronological timeline, flip an account's debug mode remotely, and
Copy-JSON / Download-NDJSON the slice for analysis.

Room schema 6→7 (new diagnostic_events table + auth_session.diagnosticsOptOut;
pre-v1 destructive fallback).

Refs Scribe M9 (#119), tasks #1174 #1175 #1176 #1177.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K55iTxn95BtshocgdE1shW

web/src/lib/api/queries.ts

@@ -50,6 +50,10 @@ export const qk = {
   coverProviders:         ()              => ['coverProviders'] as const,
   adminUsers:             ()              => ['adminUsers'] as const,
   adminInvites:           ()              => ['adminInvites'] as const,
+  adminDiagnostics:       (f: Record<string, string | number | undefined>) =>
+    ['adminDiagnostics', f] as const,
+  adminDiagnosticDevices: (userId?: string) =>
+    ['adminDiagnosticDevices', { userId: userId ?? 'all' }] as const,
   smtpConfig:             ()              => ['smtpConfig'] as const,
   suggestions:            (limit?: number) =>
     ['suggestions', { limit: limit ?? 12 }] as const,