fix(local-inference/ios): keep the screen awake during model download on the full-Bun engine (#11841)

[lalalune]

Relands the keep-awake-during-download fix for #11841 onto develop as a single squashed commit (the three source commits self-conflict in KeepAwakeBridge.swift when applied individually, so they are collapsed here).

What / why

On iOS, auto-lock could suspend the runtime mid-download and stall the model transfer (#11841). This holds the iOS idle timer open while an in-process model download is active, and — critically — makes it fire on the production full-Bun engine path, not just the JSContext compatibility bridge (device logs confirmed the sideload build runs compiledEngine=full-bun, where the host function was previously unregistered and the call a silent no-op).

• downloader.ts — drive keep_awake_set around the active download.
• KeepAwakeBridge.swift — JSContext-free core with a process-wide shared singleton + ref-counted setEnabled(_:) idle-timer holder.
• KeepAwakeBridge+JSContext.swift (new) — compat-engine installer, split out so the core compiles into the full-Bun build (which omits JavaScriptCore).
• FullBunEngineHost.swift — add a keep_awake_set host_call case.
• BridgeInstaller.swift — install the keep-awake bridge.
• plugin-capacitor-bridge/src/ios/bridge.ts — define keep_awake_set on the full-Bun path (fire-and-forget; failures can't affect the download).
• podspec — compile KeepAwakeBridge.swift into the full-Bun source set.

Testing

• plugin-local-inference downloader.test.ts — 20/20 pass.
• plugin-capacitor-bridge typecheck — clean (tsgo --noEmit).
• podspec — ruby -c Syntax OK.
• iOS on-device proof: N/A here — Swift can't be compiled in this environment and no device is reachable. The original branch (feat/multi-account-login-verification) carries the device evidence for iOS on-device model download stalls when the app backgrounds / device locks (no background URLSession for the ~5GB pull) #11841 (download completes with the idle timer held). Re-verify on device before/after merge.

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