* refactor(voice): dedupe talk audio primitives into OpenClawKit
One buffered TTS clip player (watchdog + metering) shared by iOS and
macOS replaces the near-identical pair; macOS TalkPlaybackResult was a
field-for-field duplicate of StreamingPlaybackResult and is gone. One
AVAudioPCMBuffer RMS helper replaces five per-file copies; the metered
PCM passthrough moves into PCMPlaybackEnvelope; TalkModeManager's
duplicated ElevenLabs PCM-then-mp3-retry blocks collapse into one
helper. Net -378 lines, no behavior change.
* fix(ios): drop stray blank line and resync i18n inventory
* fix(ios): drop stray blank line after helper extraction
