feat(deepseek): add DeepSeek V4 Flash/Pro models with reasoning effor…

[androidGG]

…t support

• Add deepseek-v4-flash and deepseek-v4-pro model definitions with pricing
• Set deepseek-v4-flash as the new default model
• Mark legacy deepseek-chat and deepseek-reasoner as deprecated
• Add reasoningEffort option to API handler settings (high/max)
• Add ensureReasoningContentPreserved safety net to preserve reasoning content during convertToR1Format edge cases
• Update zh-CN and en settings localization for thinking budget
• Update ThinkingBudget UI component for new model properties

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• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
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