refactor: unify providers and models tables

- Rename `llm_providers` → `providers`, `llm_provider_oauth_tokens` → `provider_oauth_tokens`
- Remove `tts_providers` and `tts_models` tables; speech models now live in the unified `models` table with `type = 'speech'`
- Replace top-level `api_key`/`base_url` columns with a JSONB `config` field on `providers`
- Rename `llm_provider_id` → `provider_id` across all references
- Add `edge-speech` client type and `conf/providers/edge.yaml` default provider
- Create new read-only speech endpoints (`/speech-providers`, `/speech-models`) backed by filtered views of the unified tables
- Remove old TTS CRUD handlers; simplify speech page to read-only + test
- Update registry loader to skip malformed YAML files instead of failing entirely
- Fix YAML quoting for model names containing colons in openrouter.yaml
- Regenerate sqlc, swagger, and TypeScript SDK

internal/command/model.go

@@ -23,7 +23,7 @@ func (h *Handler) buildModelGroup() *CommandGroup {
 			}
 			records := make([][]kv, 0, len(items))
 			for _, item := range items {
-				provName := h.resolveProviderName(cc, item.LlmProviderID)
+				provName := h.resolveProviderName(cc, item.ProviderID)
 				records = append(records, []kv{
 					{"Model", item.Name},
 					{"Provider", provName},