### What happened

Agents declared in the config `agent_list:` block are registered at startup but then **silently wiped** when `general_settings.store_model_in_db: true`. `GET /v1/agents` returns `[]` and the agents are unreachable, with no error logged.

### Reproduction

`config.yaml`:

```yaml model_list: - model_name: gpt-4o litellm_params: model: openai/gpt-4o api_key: sk-fake

general_settings: master_key: sk-1234 store_model_in_db: true # required to trigger; default false does not

agent_list: - agent_name: my-config-agent agent_card_params: protocolVersion: "0.2.9" name: my-config-agent description: "config-defined agent" url: "http://localhost:9999/a2a" version: "1.0.0" capabilities: {} defaultInputModes: ["text"] defaultOutputModes: ["text"] skills: [] ```

```bash litellm --config config.yaml --port 4000 # with a DATABASE_URL set curl -s -H "Authorization: Bearer sk-1234" http://localhost:4000/v1/agents ```

**Expected:** `my-config-agent` is listed. **Actual:** `{"agents":[]}`.

### Root cause (verified on `main` @ `190ea08`)

1. Config agents are registered via `load_agents_from_…