Thread Management and DI Container

[assada]

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[Copilot]

Pull Request Overview

This PR implements a comprehensive thread management system with dependency injection support. The changes introduce a full-stack solution for managing conversation threads, including database persistence, service architecture, and a complete UI for thread navigation.

• Introduces SQLModel-based Thread model with database persistence via Alembic migrations
• Implements dependency injection container using dependency-injector library
• Adds frontend sidebar with thread list and new chat functionality

Reviewed Changes

Copilot reviewed 37 out of 40 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
app/models/thread.py	Migrates Thread model from Pydantic to SQLModel with database schema definition
app/container.py	Implements DI container with service and repository wiring
app/services/*.py	Adds service layer for user and thread management
app/repositories/*.py	Updates repositories to use SQLModel session management
frontend/src/components/ThreadList.jsx	Implements thread list component for sidebar navigation
frontend/src/hooks/useSSE.js	Adds thread management hooks and SSE version control
frontend/src/styles.css	Implements responsive sidebar layout with thread navigation
tests/agent/services/test_agent_service.py	Updates test to reflect Thread model changes