Add Brave Search as primary web search with NanoGPT fallback

- Brave Search API is now primary (if BRAVE_API_KEY set)
- NanoGPT web search is fallback if Brave fails
- Add BRAVE_API_KEY to .env, docker-compose, and deploy workflow
- Tool calling still works for AI to request searches

utils/ai.js

@@ -7,6 +7,45 @@ const DEFAULT_MODEL = 'GLM-4.5-Air-Derestricted';
 const FALLBACK_MODEL = 'GLM-4.7-Flash';
 const FALLBACK_API_URL = 'https://api.z.ai/api/coding/paas/v4/chat/completions';
 
+// Brave Search API
+const BRAVE_API_URL = 'https://api.search.brave.com/res/v1/web/search';
+
+async function performBraveSearch(query, count = 10) {
+  const response = await axios.get(BRAVE_API_URL, {
+    params: {
+      q: query,
+      count: count,
+      extra_snippets: true
+    },
+    headers: {
+      'X-Subscription-Token': process.env.BRAVE_API_KEY,
+      'Accept': 'application/json'
+    },
+    timeout: 15000
+  });
+  
+  const results = response.data.web?.results || [];
+  
+  if (results.length === 0) {
+    return 'No search results found.';
+  }
+  
+  let formatted = 'Search results:\n\n';
+  results.slice(0, 8).forEach((result, i) => {
+    formatted += `${i + 1}. ${result.title}\n`;
+    formatted += `   ${result.url}\n`;
+    if (result.description) {
+      formatted += `   ${result.description.substring(0, 200)}${result.description.length > 200 ? '...' : ''}\n`;
+    }
+    if (result.extra_snippets && result.extra_snippets.length > 0) {
+      formatted += `   ${result.extra_snippets[0].substring(0, 150)}...\n`;
+    }
+    formatted += '\n';
+  });
+  
+  return formatted;
+}
+
 // Tool definitions for function calling
 const WEB_SEARCH_TOOL = {
   type: 'function',
@@ -77,7 +116,15 @@ function buildMessages(history, prompt, mentionedUsername, systemPrompt) {
   return messages;
 }
 
-async function performWebSearch(query) {
+// Primary: Brave Search
+async function webSearchWithBrave(query) {
+  console.log('Using Brave Search for:', query);
+  return await performBraveSearch(query);
+}
+
+// Fallback: NanoGPT web search
+async function webSearchWithNanoGPT(query) {
+  console.log('Using NanoGPT web search for:', query);
   const response = await axios.post(
     'https://nano-gpt.com/api/web',
     {
@@ -96,31 +143,52 @@ async function performWebSearch(query) {
   );
   
   const data = response.data.data;
-  const metadata = response.data.metadata;
-  
-  // Format the response nicely
-  let formattedResult = '';
   
   if (typeof data === 'string') {
-    formattedResult = data;
+    return data;
   } else if (data.answer) {
-    formattedResult = data.answer;
+    let result = data.answer;
     if (data.sources && data.sources.length > 0) {
-      formattedResult += '\n\nSources:\n';
+      result += '\n\nSources:\n';
       data.sources.forEach((source, i) => {
-        formattedResult += `${i + 1}. ${source.name || source.url}\n`;
+        result += `${i + 1}. ${source.name || source.url}\n`;
       });
     }
+    return result;
   } else if (data.results) {
-    formattedResult = 'Search results:\n';
-    data.results.slice(0, 5).forEach((result, i) => {
-      formattedResult += `${i + 1}. ${result.title || result.name}\n`;
-      if (result.url) formattedResult += `   ${result.url}\n`;
-      if (result.content) formattedResult += `   ${result.content.substring(0, 200)}...\n`;
+    let result = 'Search results:\n';
+    data.results.slice(0, 8).forEach((r, i) => {
+      result += `${i + 1}. ${r.title || r.name}\n`;
+      if (r.url) result += `   ${r.url}\n`;
+      if (r.content) result += `   ${r.content.substring(0, 200)}...\n`;
     });
+    return result;
   }
   
-  return formattedResult;
+  return 'Could not parse search results.';
+}
+
+// Unified web search function (Brave first, NanoGPT fallback)
+async function performWebSearch(query) {
+  // Try Brave first if API key is available
+  if (process.env.BRAVE_API_KEY) {
+    try {
+      return await webSearchWithBrave(query);
+    } catch (error) {
+      console.error('Brave Search failed:', error.message);
+    }
+  }
+  
+  // Fallback to NanoGPT
+  if (process.env.NANOGPT_API_KEY) {
+    try {
+      return await webSearchWithNanoGPT(query);
+    } catch (error) {
+      console.error('NanoGPT search failed:', error.message);
+    }
+  }
+  
+  throw new Error('No web search provider available');
 }
 
 async function callNanoGPTWithTools(messages, model, maxRetries = 2) {
@@ -156,7 +224,7 @@ async function callNanoGPTWithTools(messages, model, maxRetries = 2) {
             const args = JSON.parse(toolCall.function.arguments);
             console.log('AI requested web search for:', args.query);
             
-            // Perform the search
+            // Perform the search (Brave primary, NanoGPT fallback)
             const searchResult = await performWebSearch(args.query);
             
             // Add tool result to messages and continue