feat: switch Responses API to Completion API

[Junyi-99]

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[Copilot]

Pull request overview

This PR migrates the chat API from v1 to v2, introducing support for multiple LLM providers, surrounding text context, and various UI improvements. The migration includes comprehensive internationalization (Chinese to English) and adds a new apiclientV2 alongside the existing v1 client.

Key Changes:

• Migrates chat API from v1 to v2 with new protobuf definitions
• Adds support for multiple LLM providers (OpenAI, Qwen, Google, DeepSeek, Anthropic)
• Introduces surrounding text context feature for better AI understanding
• Implements model persistence and selection improvements
• Refactors stores to use Zustand persist middleware
• Adds provider-specific icons and improved model information display

Reviewed changes

Copilot reviewed 147 out of 147 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
webapp/_webapp/src/libs/apiclient.ts	Adds v2 API client with version-aware endpoint management
webapp/_webapp/src/query/api.ts	Updates API calls to use v2 endpoints, removes unused v1 message creation
webapp/_webapp/src/stores/*	Migrates stores to use persist middleware, adds surrounding text support
webapp/_webapp/src/views/**/*.tsx	Updates imports to v2, adds provider icons, improves UI components
webapp/_webapp/src/hooks/*.ts	Updates to v2 API, adds model provider information
webapp/_webapp/src/components/**/*.tsx	Enhances components with copy functionality, improved styling
proto/chat/v2/chat.proto	New v2 protobuf definition with surrounding text and model slug fields
internal/wire.go	Adds v2 service dependencies to dependency injection
internal/services/*.tmpl	Updates templates to include surrounding context

Comments suppressed due to low confidence (1)

webapp/_webapp/src/views/settings/sections/footer.tsx:9

• Unused variable versionClickCount.

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