feat: data copilot text to sql

[epipav]

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[Copilot]

Pull Request Overview

This PR adds conversation management functionality to the data copilot and enables text-to-SQL functionality. The key changes include adding conversation tracking support to maintain context across multiple queries and implementing the previously commented-out text-to-SQL agent functionality.

• Add conversationId field to chat responses and conversation tracking across the application
• Enable text-to-SQL agent functionality for database query generation
• Replace routerReasoning parameter with conversationId for improved chart generation context

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
frontend/server/repo/chat.repo.ts	Add conversationId field to interface and repository methods
frontend/server/api/chat/stream.ts	Generate and pass conversationId through chat streaming
frontend/server/api/chat/chart.ts	Replace routerReasoning with conversation-based context retrieval
frontend/lib/chat/data-copilot.ts	Enable text-to-SQL agent and add conversationId support
frontend/lib/chat/chart/generator.ts	Update chart prompt to use routerReasoning from conversation
frontend/lib/chat/agents/base-agent.ts	Remove unused blank line
frontend/app/components/shared/modules/copilot/types/copilot.types.ts	Add conversationId types and update message part types
frontend/app/components/shared/modules/copilot/store/copilot.api.service.ts	Update API service for conversationId handling
frontend/app/components/shared/modules/copilot/components/results/results-section.vue	Replace routerReasoning with conversationId prop
frontend/app/components/shared/modules/copilot/components/results/chart-results.vue	Update chart generation to use conversationId
frontend/app/components/shared/modules/copilot/components/copilot-sidebar.vue	Implement conversation state management
frontend/app/components/shared/modules/copilot/components/copilot-modal.vue	Update data handling for conversationId
database/migrations/V1756973486__addConversationIdToChatResponses.sql	Add database migration for conversation tracking

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[joanagmaia]

LGTM 👍
And the docs on the chat lib for the functions look great. Thanks for adding that