feat: add provider routing support (#143)

- Add provider routing types for order, sort, quantizations, etc.
- Support all provider routing parameters from OpenRouter API
- Enable request routing control via provider preferences

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: louisgv

src/chat/index.ts

@@ -131,6 +131,9 @@ export class OpenRouterChatLanguageModel implements LanguageModelV2 {
       reasoning: this.settings.reasoning,
       usage: this.settings.usage,
 
+      // Provider routing settings:
+      provider: this.settings.provider,
+
       // extra body:
       ...this.config.extraBody,
       ...this.settings.extraBody,

src/types/openrouter-chat-settings.ts

@@ -43,4 +43,52 @@ A unique identifier representing your end-user, which can help OpenRouter to
 monitor and detect abuse. Learn more.
 */
   user?: string;
+
+  /**
+   * Provider routing preferences to control request routing behavior
+   */
+  provider?: {
+    /**
+     * List of provider slugs to try in order (e.g. ["anthropic", "openai"])
+     */
+    order?: string[];
+    /**
+     * Whether to allow backup providers when primary is unavailable (default: true)
+     */
+    allow_fallbacks?: boolean;
+    /**
+     * Only use providers that support all parameters in your request (default: false)
+     */
+    require_parameters?: boolean;
+    /**
+     * Control whether to use providers that may store data
+     */
+    data_collection?: 'allow' | 'deny';
+    /**
+     * List of provider slugs to allow for this request
+     */
+    only?: string[];
+    /**
+     * List of provider slugs to skip for this request
+     */
+    ignore?: string[];
+    /**
+     * List of quantization levels to filter by (e.g. ["int4", "int8"])
+     */
+    quantizations?: Array<'int4' | 'int8' | 'fp4' | 'fp6' | 'fp8' | 'fp16' | 'bf16' | 'fp32' | 'unknown'>;
+    /**
+     * Sort providers by price, throughput, or latency
+     */
+    sort?: 'price' | 'throughput' | 'latency';
+    /**
+     * Maximum pricing you want to pay for this request
+     */
+    max_price?: {
+      prompt?: number | string;
+      completion?: number | string;
+      image?: number | string;
+      audio?: number | string;
+      request?: number | string;
+    };
+  };
 } & OpenRouterSharedSettings;