feat: model total credits

[CodingOnStar]

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Summary

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[Copilot]

Pull request overview

This pull request introduces model total credits tracking functionality to the Dify platform. The changes add support for tracking trial credits usage across multiple LLM providers (OpenAI, Anthropic, Gemini, xAI, DeepSeek, and Tongyi) with a unified quota display panel.

Key Changes:

• Added credit tracking fields to workspace model (trial_credits, trial_credits_used, next_credit_reset_date)
• Redesigned quota panel to show consolidated credits with provider-specific status indicators
• Added support for 4 new LLM providers (Gemini, xAI/Grok, DeepSeek, Tongyi) with corresponding icons
• Updated i18n strings across English, Chinese, and Japanese locales

Reviewed changes

Copilot reviewed 33 out of 39 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
web/models/common.ts	Added three new fields to ICurrentWorkspace for credit tracking
web/i18n/zh-Hans/common.json	Added new translation keys for model quota display and reset date
web/i18n/zh-Hans/billing.json	Updated tooltip text to include new supported providers
web/i18n/ja-JP/common.json	Added Japanese translations for new quota-related strings
web/i18n/ja-JP/billing.json	Updated Japanese tooltip for message credits
web/i18n/en-US/common.json	Added English translations for quota panel features
web/i18n/en-US/billing.json	Updated English tooltip to list all supported providers
web/context/app-context.tsx	Added isValidatingCurrentWorkspace flag and initialized new credit fields
web/app/components/plugins/provider-card.tsx	Simplified callback function syntax
web/app/components/header/account-setting/model-provider-page/utils.ts	Converted provider list to enum and added model name mappings
web/app/components/header/account-setting/model-provider-page/provider-added-card/quota-panel.tsx	Complete redesign to show unified credit quota with provider icons
web/app/components/header/account-setting/model-provider-page/provider-added-card/index.tsx	Removed per-provider quota display (moved to unified panel)
web/app/components/header/account-setting/model-provider-page/index.tsx	Added unified quota panel component and workspace refresh effect
web/app/components/billing/apps-full-in-dialog/index.spec.tsx	Updated test context to include new credit fields
web/app/components/base/icons/*	Added new icon components for Gemini, Grok, DeepSeek, Tongyi, OpenAI Small, and Anthropic Short

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