feat(providers): OpenRouter adapter + Ollama embedding support — M3-004/006 (#311)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/agent/provider.service.ts

@@ -8,7 +8,12 @@ import type {
   ProviderHealth,
   ProviderInfo,
 } from '@mosaic/types';
-import { AnthropicAdapter, OllamaAdapter, OpenAIAdapter } from './adapters/index.js';
+import {
+  AnthropicAdapter,
+  OllamaAdapter,
+  OpenAIAdapter,
+  OpenRouterAdapter,
+} from './adapters/index.js';
 import type { TestConnectionResultDto } from './provider.dto.js';
 
 /** Default health check interval in seconds */
@@ -46,6 +51,7 @@ export class ProviderService implements OnModuleInit, OnModuleDestroy {
       new OllamaAdapter(this.registry),
       new AnthropicAdapter(this.registry),
       new OpenAIAdapter(this.registry),
+      new OpenRouterAdapter(),
     ];
 
     // Run all adapter registrations first (Ollama, Anthropic, and any future adapters)