Swifty 3b1b2fe30c feat(backend): Extract backend copilot/chat enhancements from hackathon (#11719) ...

This PR extracts backend changes from the hackathon/copilot branch,
adding enhanced chat capabilities, agent management tools, store
embeddings, and hybrid search functionality.

### Changes 🏗️

**Chat Features:**
- Added chat database layer (`db.py`) for conversation and message
persistence
- Extended chat models with new types and response structures
- New onboarding system prompt for guided user experiences
- Enhanced chat routes with additional endpoints
- Expanded chat service with more capabilities

**Chat Agent Tools:**
- `agent_output.py` - Handle agent execution outputs
- `create_agent.py` - Tool for creating new agents via chat
- `edit_agent.py` - Tool for modifying existing agents
- `find_library_agent.py` - Search and discover library agents
- Enhanced `run_agent.py` with additional functionality
- New `models.py` for shared tool types

**Store Enhancements:**
- `embeddings.py` - Vector embeddings support for semantic search
- `hybrid_search.py` - Combined keyword and semantic search
- `backfill_embeddings.py` - Utility for backfilling existing data
- Updated store database operations

**Admin:**
- Enhanced store admin routes

**Data Layer:**
- New `understanding.py` module for agent understanding/context

**Database Migrations:**
- `add_chat_tables` - Chat conversation and message tables
- `add_store_embeddings` - Embeddings storage for store items
- `enhance_search` - Search index improvements

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  - [x] Chat endpoints respond correctly
  - [x] Agent tools (create/edit/find/run) function properly
  - [x] Store embeddings and hybrid search work
  - [x] Database migrations apply cleanly

#### For configuration changes:

- [x] `.env.default` is updated or already compatible with my changes
- [x] `docker-compose.yml` is updated or already compatible with my
changes
- [x] I have included a list of my configuration changes in the PR
description (under **Changes**)

---------

Co-authored-by: Torantulino <40276179@live.napier.ac.uk>

2026-01-15 11:11:36 +01:00

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