feat(providers): add Together AI, Baseten, and Ollama Cloud model providers (#4830)

* feat(providers): add Together AI, Baseten, and Ollama Cloud model providers

* fix(providers): guard Ollama streaming fast-path with hasActiveTools

Match Together/Baseten/Fireworks: when tools are supplied but all are
filtered out (usageControl 'none'), take the single streaming call instead
of an extra non-streaming round-trip.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(providers): filter non-chat model types from Together model list

* refactor(providers): dedupe Ollama Cloud upstream schema

ollamaCloudUpstreamResponseSchema was byte-for-byte identical to
ollamaUpstreamResponseSchema (both /api/tags endpoints return the same
{ models: [{ name }] } shape). Drop the duplicate and reuse the shared schema.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

scripts/check-api-validation-contracts.ts

@@ -9,8 +9,8 @@ const QUERY_HOOKS_DIR = path.join(ROOT, 'apps/sim/hooks/queries')
 const SELECTOR_HOOKS_DIR = path.join(ROOT, 'apps/sim/hooks/selectors')
 
 const BASELINE = {
-  totalRoutes: 758,
-  zodRoutes: 758,
+  totalRoutes: 761,
+  zodRoutes: 761,
   nonZodRoutes: 0,
 } as const