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930699ec35
Users expected setting AI_MODEL to a comma-separated list to expose multiple models in the picker, but the value was used verbatim as a single model id, leaving the picker with only the "Server Default" fallback. Add a third-priority fallback in loadEnvServerModelsConfig: when AI_MODELS_CONFIG and ai-models.json are both absent, AI_MODEL contains a comma, and AI_PROVIDER is set to a known provider, synthesize an equivalent ServerModelsConfig with the provider's models trimmed, deduplicated, and the first marked as default. Also makes getAIModel and getValidationModel pick the first comma-split value when falling back to AI_MODEL, so requests started before the client picker hydrates still resolve to a real model id. Docs (en/cn/ja) and env.example updated; tests cover the new fallback plus the no-comma / no-AI_PROVIDER negative cases.