feat: Add Admin UI for Product Catalog Provider Configuration

[bokelley]

Summary

Product catalog providers are currently only configurable via direct database updates. Add Admin UI support for configuring these providers per-tenant.

Background

The sales agent supports 5 product catalog provider types:

• database (default) - reads products from PostgreSQL
• mcp - calls an upstream MCP server for products (federation)
• ai - uses AI/RAG to match products based on brief
• signals - discovery via Signals protocol
• hybrid - combines multiple sources with configurable ranking

Currently configured via tenant config.product_catalog JSON field:

{
  "product_catalog": {
    "provider": "hybrid",
    "config": {
      "signals_discovery": {
        "enabled": true,
        "upstream_url": "http://signals-agent:8080/mcp/"
      },
      "ranking_strategy": "signals_first"
    }
  }
}

Requirements

1. Add product catalog provider selection to tenant settings UI
2. Show provider-specific configuration fields based on selection
3. Validate configuration before saving
4. Display current provider status/health

Provider-specific config fields

Provider	Config Fields
database	(none - uses local products table)
mcp	upstream_url, tool_name, timeout, optional auth headers
ai	AI model settings, embedding config
signals	upstream_url, discovery options
hybrid	sub-provider configs, ranking_strategy

Files

• product_catalog_providers/ - provider implementations
• product_catalog_providers/factory.py - provider registry
• src/admin/ - Admin UI (needs new section)

Acceptance Criteria

• Tenant admins can select product catalog provider from dropdown
• Provider-specific config fields appear based on selection
• Configuration is validated before save
• Current provider health/status is visible
• Changes take effect without server restart

[bokelley]

evolved to an AI product ranker