feat(agents): add category and display fields to AgentType model

Add 6 new fields to AgentType for better organization and UI display:
- category: enum for grouping (development, design, quality, etc.)
- icon: Lucide icon identifier for UI
- color: hex color code for visual distinction
- sort_order: display ordering within categories
- typical_tasks: list of tasks the agent excels at
- collaboration_hints: agent slugs that work well together

Backend changes:
- Add AgentTypeCategory enum to enums.py
- Update AgentType model with 6 new columns and indexes
- Update schemas with validators for new fields
- Add category filter and /grouped endpoint to routes
- Update CRUD with get_grouped_by_category method
- Update seed data with categories for all 27 agents
- Add migration 0007

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/routes/agent_types.py

@@ -81,6 +81,13 @@ def _build_agent_type_response(
         mcp_servers=agent_type.mcp_servers,
         tool_permissions=agent_type.tool_permissions,
         is_active=agent_type.is_active,
+        # Category and display fields
+        category=agent_type.category,
+        icon=agent_type.icon,
+        color=agent_type.color,
+        sort_order=agent_type.sort_order,
+        typical_tasks=agent_type.typical_tasks or [],
+        collaboration_hints=agent_type.collaboration_hints or [],
         created_at=agent_type.created_at,
         updated_at=agent_type.updated_at,
         instance_count=instance_count,
@@ -300,6 +307,7 @@ async def list_agent_types(
     request: Request,
     pagination: PaginationParams = Depends(),
     is_active: bool = Query(True, description="Filter by active status"),
+    category: str | None = Query(None, description="Filter by category"),
     search: str | None = Query(None, description="Search by name, slug, description"),
     current_user: User = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
@@ -314,6 +322,7 @@ async def list_agent_types(
         request: FastAPI request object
         pagination: Pagination parameters (page, limit)
         is_active: Filter by active status (default: True)
+        category: Filter by category (e.g., "development", "design")
         search: Optional search term for name, slug, description
         current_user: Authenticated user
         db: Database session
@@ -328,6 +337,7 @@ async def list_agent_types(
             skip=pagination.offset,
             limit=pagination.limit,
             is_active=is_active,
+            category=category,
             search=search,
         )
 
@@ -354,6 +364,51 @@ async def list_agent_types(
         raise
 
 
+@router.get(
+    "/grouped",
+    response_model=dict[str, list[AgentTypeResponse]],
+    summary="List Agent Types Grouped by Category",
+    description="Get all agent types organized by category",
+    operation_id="list_agent_types_grouped",
+)
+@limiter.limit(f"{60 * RATE_MULTIPLIER}/minute")
+async def list_agent_types_grouped(
+    request: Request,
+    is_active: bool = Query(True, description="Filter by active status"),
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+) -> Any:
+    """
+    Get agent types grouped by category.
+
+    Returns a dictionary where keys are category names and values
+    are lists of agent types, sorted by sort_order within each category.
+
+    Args:
+        request: FastAPI request object
+        is_active: Filter by active status (default: True)
+        current_user: Authenticated user
+        db: Database session
+
+    Returns:
+        Dictionary mapping category to list of agent types
+    """
+    try:
+        grouped = await agent_type_crud.get_grouped_by_category(db, is_active=is_active)
+
+        # Transform to response objects
+        result: dict[str, list[AgentTypeResponse]] = {}
+        for category, types in grouped.items():
+            result[category] = [
+                _build_agent_type_response(t, instance_count=0) for t in types
+            ]
+
+        return result
+    except Exception as e:
+        logger.error(f"Error getting grouped agent types: {e!s}", exc_info=True)
+        raise
+
+
 @router.get(
     "/{agent_type_id}",
     response_model=AgentTypeResponse,