feat: i18n plugin support merge custom plugin config && add isResouecesReady state

[caohuilin]

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• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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Rsdoctor Bundle Diff Analysis

📁 bundle-diff

Path: benchmark/bundle-diff/dist/rsdoctor-data.json

📌 Baseline Commit: c9ea637f4b | PR: #7931

Metric	Current	Baseline	Change
📊 Total Size	497.5 KB	497.5 KB	0 B (0.0%)
📄 JavaScript	487.6 KB	487.6 KB	0 B (0.0%)
🎨 CSS	1.2 KB	1.2 KB	0 B (0.0%)
🌐 HTML	5.9 KB	5.9 KB	0 B (0.0%)
📁 Other Assets	2.8 KB	2.8 KB	0 B (0.0%)

📦 Download Diff Report: bundle-diff Bundle Diff

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[Copilot]

Pull request overview

This PR adds support for merging custom plugin configurations and introduces an isResourcesReady state to track translation resource loading. Additionally, it implements chained backend functionality, allowing the simultaneous use of HTTP/FS and SDK backends for progressive resource loading.

Key changes:

• Added i18next-chained-backend dependency to enable multiple backend chaining
• Introduced isResourcesReady property in useModernI18n to check if translation resources are loaded
• Implemented config merging from runtime config with plugin options
• Added new methods to SdkBackend for tracking loading state

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Added dependency for i18next-chained-backend@4.6.2
packages/runtime/plugin-i18n/package.json	Added i18next-chained-backend and @modern-js/runtime-utils dependencies
packages/runtime/plugin-i18n/src/shared/type.ts	Added cacheHitMode option and documentation for chained backend support
packages/runtime/plugin-i18n/src/runtime/index.tsx	Implemented config merging, improved language change handling with refs, and added minimal i18n instance fallback
packages/runtime/plugin-i18n/src/runtime/i18n/instance.ts	Added index signature to I18nInstance interface for flexibility
packages/runtime/plugin-i18n/src/runtime/i18n/backend/sdk-backend.ts	Added methods to check loading state: isLoading(), getLoadingResources(), and hasLoadingResources()
packages/runtime/plugin-i18n/src/runtime/i18n/backend/middleware.ts	Implemented chained backend logic to use both HTTP and SDK backends together
packages/runtime/plugin-i18n/src/runtime/i18n/backend/middleware.node.ts	Implemented chained backend logic for Node.js environment (FS + SDK)
packages/runtime/plugin-i18n/src/runtime/i18n/backend/index.ts	Added logic to detect and configure chained backend when both loadPath and SDK are present
packages/runtime/plugin-i18n/src/runtime/context.tsx	Added isResourcesReady property and implementation to check if translation resources are loaded
packages/document/docs/zh/guides/advanced-features/international/*.mdx	Added Chinese documentation for chained backend and isResourcesReady feature
packages/document/docs/en/guides/advanced-features/international/*.mdx	Added English documentation for chained backend and isResourcesReady feature

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

@caohuilin I've opened a new pull request, #7934, to work on those changes. Once the pull request is ready, I'll request review from you.