fix: update Dorothy and Harold to very elderly voices

fix: update Marcus to 20yo Gen Z persona and voice

fix: completely change voices for Dorothy, Harold, and Marcus

fix: characters now know their identity; use real emotion tags; tune voices (Harold/Carlos to Edge, faster Dorothy)

feat: switch to Kokoro ONNX TTS; fix Carlos Spanish voice; diverse per-avatar voices

fix: return base64 audio data URI from lumi_api; tune per-avatar edge-tts voices

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