tone: switch from 중고등학생 style to friendly AI expert tone (정중한 평어체) for news/model/space prompts + fallback templates

fix: 2-phase model/space fetch — basic info immediate + LLM best-effort + sort fallback (resolves empty models/spaces issue)

fix: 2-phase model/space fetch — basic info immediate + LLM best-effort + sort fallback (resolves empty models/spaces issue)

fix: 2-phase model/space fetch — basic info immediate + LLM best-effort + sort fallback (resolves empty models/spaces issue)

deps: pin huggingface_hub>=0.24.0 for trending_score sort support

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