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

devenv/docker-compose.yml

@@ -156,20 +156,20 @@ services:
         condition: service_healthy
     restart: unless-stopped
 
-  sparse:
-    build:
-      context: ..
-      dockerfile: docker/Dockerfile.sparse
-    container_name: memoh-dev-sparse
-    ports:
-      - "${MEMOH_DEV_SPARSE_PORT:-18085}:8085"
-    healthcheck:
-      test: ["CMD-SHELL", "python -c \"import urllib.request; urllib.request.urlopen('http://127.0.0.1:8085/health')\" || exit 1"]
-      interval: 15s
-      timeout: 10s
-      start_period: 30s
-      retries: 3
-    restart: unless-stopped
+  # sparse:
+  #   build:
+  #     context: ..
+  #     dockerfile: docker/Dockerfile.sparse
+  #   container_name: memoh-dev-sparse
+  #   ports:
+  #     - "${MEMOH_DEV_SPARSE_PORT:-18085}:8085"
+  #   healthcheck:
+  #     test: ["CMD-SHELL", "python -c \"import urllib.request; urllib.request.urlopen('http://127.0.0.1:8085/health')\" || exit 1"]
+  #     interval: 15s
+  #     timeout: 10s
+  #     start_period: 30s
+  #     retries: 3
+  #   restart: unless-stopped
 
 volumes:
   postgres_data: