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

db/migrations/0041_provider_model_refactor.up.sql

@@ -1,14 +1,17 @@
 -- 0041_provider_model_refactor
 -- Move client_type to llm_providers, add icon, replace model columns with config JSONB.
+-- NOTE: This migration is a no-op on fresh databases where the canonical schema already applies.
 
--- 1. Add client_type and icon to llm_providers
-ALTER TABLE llm_providers
-  ADD COLUMN IF NOT EXISTS client_type TEXT NOT NULL DEFAULT 'openai-completions',
-  ADD COLUMN IF NOT EXISTS icon TEXT;
+DO $$
+BEGIN
+  IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'llm_providers') THEN
+    RETURN;
+  END IF;
+
+  ALTER TABLE llm_providers
+    ADD COLUMN IF NOT EXISTS client_type TEXT NOT NULL DEFAULT 'openai-completions',
+    ADD COLUMN IF NOT EXISTS icon TEXT;
 
--- 2–6. Backfill and migrate only when old columns exist (idempotent for fresh DBs).
-DO $$ BEGIN
-  -- Back-fill provider client_type from models.client_type (old column)
   IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'models' AND column_name = 'client_type') THEN
     UPDATE llm_providers p
     SET client_type = sub.client_type
@@ -21,19 +24,16 @@ DO $$ BEGIN
     WHERE p.id = sub.llm_provider_id;
   END IF;
 
-  -- Add CHECK constraint (skip if already present)
   IF NOT EXISTS (SELECT 1 FROM information_schema.table_constraints WHERE constraint_name = 'llm_providers_client_type_check') THEN
     ALTER TABLE llm_providers
       ADD CONSTRAINT llm_providers_client_type_check
       CHECK (client_type IN ('openai-responses', 'openai-completions', 'anthropic-messages', 'google-generative-ai'));
   END IF;
 
-  -- Add config JSONB to models
   IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'models' AND column_name = 'config') THEN
     ALTER TABLE models ADD COLUMN config JSONB NOT NULL DEFAULT '{}'::jsonb;
   END IF;
 
-  -- Migrate existing columns into config (only when old columns exist)
   IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'models' AND column_name = 'dimensions') THEN
     UPDATE models SET config = jsonb_strip_nulls(jsonb_build_object(
       'dimensions', dimensions,
@@ -51,11 +51,9 @@ DO $$ BEGIN
   END IF;
 END $$;
 
--- Drop old columns and constraints (IF EXISTS makes these safe on fresh DBs)
 ALTER TABLE models DROP CONSTRAINT IF EXISTS models_client_type_check;
 ALTER TABLE models DROP CONSTRAINT IF EXISTS models_chat_client_type_check;
 ALTER TABLE models DROP CONSTRAINT IF EXISTS models_dimensions_check;
-
 ALTER TABLE models DROP COLUMN IF EXISTS client_type;
 ALTER TABLE models DROP COLUMN IF EXISTS dimensions;
 ALTER TABLE models DROP COLUMN IF EXISTS input_modalities;