feat(web): add Perplexity Sonar as alternative search provider

src/config/types.tools.ts

@@ -222,8 +222,8 @@ export type ToolsConfig = {
     search?: {
       /** Enable web search tool (default: true when API key is present). */
       enabled?: boolean;
-      /** Search provider (currently "brave"). */
-      provider?: "brave";
+      /** Search provider ("brave" or "perplexity"). */
+      provider?: "brave" | "perplexity";
       /** Brave Search API key (optional; defaults to BRAVE_API_KEY env var). */
       apiKey?: string;
       /** Default search results count (1-10). */
@@ -232,6 +232,15 @@ export type ToolsConfig = {
       timeoutSeconds?: number;
       /** Cache TTL in minutes for search results. */
       cacheTtlMinutes?: number;
+      /** Perplexity-specific configuration (used when provider="perplexity"). */
+      perplexity?: {
+        /** API key for Perplexity or OpenRouter (defaults to PERPLEXITY_API_KEY or OPENROUTER_API_KEY env var). */
+        apiKey?: string;
+        /** Base URL for API requests (defaults to OpenRouter: https://openrouter.ai/api/v1). */
+        baseUrl?: string;
+        /** Model to use (defaults to "perplexity/sonar-pro"). */
+        model?: string;
+      };
     };
     fetch?: {
       /** Enable web fetch tool (default: true). */